W1-1 Earth system

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Questions and Answers

Within the context of Earth System Science, which statement most accurately characterizes the role of Geographic Information Systems (GIS) in contemporary research?

  • GIS is employed as a data transmission protocol, facilitating the secure transfer of sensitive Earth observation data between international research institutions.
  • GIS primarily functions as a visualization tool, rendering complex datasets into easily digestible graphical formats for public consumption.
  • GIS serves as a sophisticated tool for data storage, analysis, and modeling, enabling scientists to discern complex spatial and temporal relationships within vast Earth observation datasets. (correct)
  • GIS is utilized exclusively for the real-time monitoring of atmospheric phenomena, leveraging satellite data to predict short-term weather patterns.

If a newly discovered exoplanet exhibits a consistent flux of energy into its primary atmospheric reservoir that is demonstrably less than the flux emanating from it, how would the atmospheric reservoir be classified within earth system science principles?

  • A homeostatic regulator, exhibiting negative feedback mechanisms.
  • A source, actively emitting energy to adjacent reservoirs. (correct)
  • A sink, actively absorbing energy from adjacent reservoirs.
  • A dynamic equilibrium, as fluxes are inherently balanced over extended durations.

Considering Earth as a closed system, what is the most profound implication regarding the manipulation or extraction of resources from one of its reservoirs?

  • The removal of a finite quantity of matter from any reservoir will be directly compensated by an influx of equivalent matter from the exosphere, preserving equilibrium.
  • A closed system necessitates that the amount of matter within each reservoir remains constant, thereby precluding the possibility of resource depletion or environmental degradation.
  • Resource extraction from the geosphere will have negligible impact on atmospheric composition due to the vastness of the system.
  • Disturbances in one reservoir will propagate and induce alterations in other reservoirs, eventually impacting the dynamic equilibrium of the entire Earth system. (correct)

What is the most critical consideration when evaluating the long-term sustainability of extracting water from a deep, confined aquifer with a very long residence time?

<p>The sequestration timescale relative to the rate of extraction. (A)</p> Signup and view all the answers

A research team is constructing a box model to simulate the global carbon cycle. Which element must be quantifiably represented to ensure both accuracy and applicability?

<p>The processes and rates by which carbon moves between reservoirs. (A)</p> Signup and view all the answers

Within the context of Earth System Science, what is the epistemological significance of 'models'?

<p>Models function as simplified representations of processes, which can represent some of Earth's systems. (A)</p> Signup and view all the answers

In a complex Earth system model predicting global climate change, what is the most critical aspect to consider regarding the interaction between the atmosphere and hydrosphere?

<p>The wavelength-dependent radiative transfer properties of various greenhouse gases and the thermal inertia of ocean water. (B)</p> Signup and view all the answers

The Earth is considered a closed system. Why is this concept fundamental to understanding global biogeochemical cycles and anthropogenic impacts?

<p>Because the Earth's boundaries prevent any exchange of matter with the external environment, and changes in one reservoir will affect other parts. (C)</p> Signup and view all the answers

When considering a dynamic Earth system, how does the residence time of a particular element within a reservoir influence the system's response to perturbations?

<p>A long residence time buffers the system against rapid changes, potentially delaying responses to external forces or inputs. (A)</p> Signup and view all the answers

Imagine a scenario where a major volcanic eruption injects a significant quantity of sulfur dioxide ($SO_2$) into the stratosphere. According to Earth system science principles, what cascade of effects is most likely to ensue?

<p>Transient increase in global albedo due to sulfate aerosol formation, potentially leading to temporary cooling, altered precipitation patterns, and subsequent impacts on the biosphere and hydrosphere. (A)</p> Signup and view all the answers

A scientist is studying the impact of deforestation on regional climate. How might they utilize remote sensing and GIS to assess changes in land surface temperature and evapotranspiration rates?

<p>By analyzing satellite-derived vegetation indices, thermal infrared imagery, and GIS-based spatial analysis to quantify changes in land cover, surface temperature, and evapotranspiration patterns. (C)</p> Signup and view all the answers

Within the framework of Earth System Science, how might we conceptualize the role of a beaver dam in modifying the flux and storage of water and sediment within a watershed?

<p>As a localized negative feedback mechanism, dampening the amplitude of flood events and promoting sediment retention, thereby altering channel morphology and riparian habitat distribution. (A)</p> Signup and view all the answers

A scientist is trying to model a newly discovered ecosystem in the deep sea. Why should they use an 'Earth System Science' approach?

<p>Because it allows for a holistic understanding of interacting biotic and abiotic components. (B)</p> Signup and view all the answers

Which of the following statements presents the most accurate and nuanced representation of the concept of 'sequestration'?

<p>Sequestration describes a process whereby matter or energy is isolated within a reservoir for extended periods, effectively removing it from active participation in biogeochemical cycles and influencing long-term Earth system dynamics. (C)</p> Signup and view all the answers

A research team aims to predict the impact of increased global temperatures on the distribution of a keystone species of Arctic algae. Which methodological approach would provide the most robust and comprehensive predictive capabilities?

<p>Developing a complex Earth system model incorporating radiative transfer, ocean circulation, sea ice dynamics, and algal ecophysiology, validated against observational data and uncertainty quantification. (D)</p> Signup and view all the answers

How does the modification of albedo by extensive deforestation in the Amazon basin directly influence the radiative forcing within the Earth system, considering both short-term and long-term feedback mechanisms?

<p>It increases albedo due to the exposure of lighter soils, leading to a short-term negative radiative forcing, which is counteracted over time by the release of stored carbon and a shift in biogeochemical cycles toward positive radiative forcing. (C)</p> Signup and view all the answers

Assuming a scenario where a previously stable, heavily glaciated region undergoes rapid deglaciation, what feedback loop concerning the interaction between the cryosphere and the geosphere is most likely to exacerbate the initial ice loss?

<p>The exposure of darker bedrock and sediment, decreasing local albedo and increasing absorbed solar radiation, leading to accelerated local warming and further ice melt, enhanced by permafrost thaw and methane release. (C)</p> Signup and view all the answers

Considering the complex interplay of biogeochemical cycles within Earth system reservoirs, what is the most critical limiting factor regulating the efficiency of carbon sequestration by artificial ocean fertilization strategies?

<p>The stoichiometric imbalance created by excess nutrient supply, leading to phytoplankton blooms dominated by species with inefficient carbon export mechanisms and subsequent remineralization in surface waters. (D)</p> Signup and view all the answers

In the context of Earth's atmospheric composition, what is the most significant consequence of a sustained increase in anthropogenic emissions of nitrous oxide ($N_2O$) beyond pre-industrial levels?

<p>An amplified depletion of stratospheric ozone ($O_3$) via catalytic cycles involving reactive nitrogen species, coupled with a disproportionately large radiative forcing effect relative to carbon dioxide on a per-molecule basis. (B)</p> Signup and view all the answers

Assuming a scenario wherein a large-scale geoengineering project successfully reduces global mean surface temperature by artificially enhancing planetary albedo, what unintended consequence related to the biosphere is most likely to arise?

<p>A substantial decline in oceanic pH due to continued absorption of atmospheric carbon dioxide, leading to widespread coral bleaching, disruption of marine food webs, and a decrease in marine biodiversity. (A)</p> Signup and view all the answers

How does the introduction of genetically modified (GM) crops, engineered for increased nitrogen use efficiency, affect the global nitrogen cycle and its interactions with other Earth system reservoirs?

<p>It leads to a decrease in nitrous oxide ($N_2O$) emissions from agricultural soils, mitigating ozone depletion and reducing the greenhouse gas forcing associated with nitrogen-based fertilizers. (B)</p> Signup and view all the answers

Considering the principles of Earth System Science, what is the most profound implication of widespread permafrost thaw in Arctic regions on global climate dynamics?

<p>A substantial release of previously sequestered organic carbon in the form of methane ($CH_4$) and carbon dioxide ($CO_2$), creating a positive feedback loop that accelerates global warming and potentially triggers abrupt climate shifts. (A)</p> Signup and view all the answers

If a geoengineering scheme involving stratospheric aerosol injection (SAI) is abruptly terminated after several decades of continuous deployment, what is the most likely consequence for the Earth's climate system, considering both physical and biogeochemical feedbacks?

<p>An accelerated increase in global average temperatures, potentially exceeding pre-intervention levels, due to the rapid unmasking of accumulated greenhouse gas forcing and associated feedback mechanisms such as ice-albedo and permafrost thaw. (B)</p> Signup and view all the answers

Considering the complex interactions between the atmosphere and the biosphere, how does large-scale afforestation in arid and semi-arid regions impact regional and global hydrological cycles, taking into account both biophysical and biogeochemical effects?

<p>It may decrease regional runoff and streamflow due to increased water uptake by trees, with potentially negative impacts on water availability for downstream ecosystems and human populations, despite potential carbon sequestration benefits. (A)</p> Signup and view all the answers

In the context of Earth System Science, what is the most critical challenge in accurately modeling future sea-level rise, considering the complex interactions between the cryosphere, hydrosphere, and geosphere?

<p>Accurately predicting future rates of ice sheet mass loss from Greenland and Antarctica, which necessitates a comprehensive understanding of ice dynamics, basal lubrication, and ocean-ice interactions under changing climate conditions. (B)</p> Signup and view all the answers

How does the interaction between tectonic processes and the carbon cycle, specifically through volcanic outgassing and silicate weathering, influence long-term climate stability on geological timescales?

<p>Volcanic outgassing releases $CO_2$ into the atmosphere, while silicate weathering consumes $CO_2$ over millions of years; this feedback loop acts as a planetary thermostat, stabilizing Earth's climate against extreme variations. (D)</p> Signup and view all the answers

In the context of Earth system modeling, what is the fundamental limitation of relying solely on historical data to project future climate change scenarios, particularly when considering abrupt and nonlinear system responses?

<p>Historical data can only reflect past climate conditions and may not capture the thresholds or tipping points beyond which Earth system processes exhibit fundamentally different behavior under unprecedented forcing scenarios. (D)</p> Signup and view all the answers

Considering the dynamic interactions among Earth system reservoirs, what would be the most plausible long-term consequence of a complete shutdown of the Atlantic Meridional Overturning Circulation (AMOC)?

<p>A complex pattern of regional climate changes, including cooling in the North Atlantic region, altered precipitation patterns across the Northern Hemisphere, and potential disruptions to marine ecosystems and fisheries. (D)</p> Signup and view all the answers

How does the weathering of basaltic rocks, compared to granitic rocks, influence the global carbon cycle and long-term climate regulation, considering differences in mineral composition, weathering rates, and alteration products?

<p>Basalt weathering has a higher weathering rate and produces more alkaline solutions that enhance $CO_2$ sequestration in the ocean, making it a more effective long-term sink for atmospheric carbon than granitic weathering. (C)</p> Signup and view all the answers

In coupled climate-carbon cycle models, what is the most significant uncertainty regarding the response of terrestrial ecosystems to elevated atmospheric carbon dioxide concentrations and rising temperatures?

<p>The precise magnitude and spatial distribution of the $CO_2$ fertilization effect on plant growth, particularly in nutrient-limited ecosystems, and its subsequent impact on carbon storage in biomass and soils. (C)</p> Signup and view all the answers

In the context of Earth system cycles, what is the most critical implication of widespread deforestation on the movement of carbon between reservoirs?

<p>It reduces the capacity of the biosphere to act as a carbon sink, increasing atmospheric carbon concentrations. (B)</p> Signup and view all the answers

Considering the Earth's energy cycle, how does a sustained increase in cloud cover, particularly low-altitude clouds, most directly influence the balance between incoming solar radiation and outgoing terrestrial radiation?

<p>By increasing the Earth's albedo, reflecting more solar radiation back into space and cooling the planet. (A)</p> Signup and view all the answers

How would the intentional introduction of iron into nutrient-poor ocean regions to stimulate phytoplankton growth most directly influence the global carbon cycle?

<p>By enhancing organic carbon sequestration in deep ocean sediments through increased biological productivity. (A)</p> Signup and view all the answers

What long-term impact on regional climate dynamics is most likely to result from large-scale urbanization, considering alterations to surface energy budgets and hydrological processes?

<p>An increase in local surface temperatures and altered precipitation patterns due to changes in albedo and land cover. (D)</p> Signup and view all the answers

Assuming a project that successfully implements Carbon Capture and Storage (CCS) technology at a coal-fired power plant, what potential long-term risk to Earth system reservoirs should be most carefully monitored to prevent unintended consequences?

<p>Leakage of stored CO2 from geological reservoirs into the atmosphere or groundwater. (A)</p> Signup and view all the answers

How does the albedo of a terrestrial surface undergoing desertification influence regional temperature and precipitation patterns, considering feedback mechanisms with the atmosphere?

<p>Increased albedo reflects more solar radiation, leading to cooler temperatures and decreased precipitation. (C)</p> Signup and view all the answers

In the context of biogeochemical cycles, how would widespread introduction of genetically modified crops engineered for increased phosphorus uptake most likely affect phosphorus availability in other environmental reservoirs?

<p>Reduce phosphorus availability in soils, potentially limiting the growth of non-modified plants. (B)</p> Signup and view all the answers

If a large-scale coastal wetland restoration project is undertaken, what primary biogeochemical feedback loop is most likely to mitigate climate change, considering the interactions between the atmosphere, hydrosphere, and biosphere?

<p>Enhanced carbon sequestration in wetland soils and biomass, removing carbon dioxide from the atmosphere. (C)</p> Signup and view all the answers

How does the combustion of fossil fuels affect the sulfur cycle, and what is the most significant environmental consequence of this interaction?

<p>It releases sulfur dioxide into the atmosphere, leading to acid rain and ecosystem acidification. (A)</p> Signup and view all the answers

How would a substantial increase in the flux of freshwater from melting glaciers into the North Atlantic Ocean most likely influence the Atlantic Meridional Overturning Circulation (AMOC), and what could be the potential global climate consequences?

<p>Slowing or collapse of the AMOC, leading to decreased heat transport to high latitudes and regional cooling. (A)</p> Signup and view all the answers

Given the principles of Earth system science, why is uncertainty considered an inherent and unavoidable aspect of scientific knowledge, particularly when modeling complex environmental phenomena?

<p>Because scientific models are simplifications of reality, and natural systems exhibit inherent variability and nonlinearity. (B)</p> Signup and view all the answers

What role do observations play in the scientific method, and why are they considered fundamental to advancing scientific understanding of Earth system processes?

<p>Observations provide empirical evidence that can be used to formulate, test, and refine scientific hypotheses and theories. (D)</p> Signup and view all the answers

What distinguishes a 'theory' from a 'hypothesis' in the context of Earth system science, and how does a hypothesis evolve into a theory through scientific inquiry?

<p>A theory has been extensively tested and supported by evidence, whereas a hypothesis is a testable explanation or prediction. (A)</p> Signup and view all the answers

In what ways can human activities affect natural cycles, and what are the potential environmental consequences of disrupting the dynamic equilibrium of these cycles?

<p>Human activities can alter natural cycles, leading to disruptions in system equilibrium and unintended environmental consequences. (D)</p> Signup and view all the answers

When scientists study how feedback functions within a system, what indicates the system is self-regulating?

<p>When the system's response goes in the opposite direction of the initial input. (A)</p> Signup and view all the answers

Flashcards

Earth System Science

A holistic approach to studying the Earth as a whole system with interacting parts, including the ocean, atmosphere, continents, lakes, rivers, soils, plants, and animals.

Tool for Earth observation

Remote sensing with satellites

System

A portion of the universe isolated for observing and measuring changes.

Model

A representation of something, often a simplified version of a complex original.

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Box model

A simple graphical representation of a system, showing essential features, processes, rates, and distribution of matter or energy.

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Flux

The amount of energy or matter transferred in a system

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Reservoirs

Places where energy or matter is stored in a system.

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Earth's Reservoirs

Earth's four vast interconnected components: atmosphere, hydrosphere, biosphere, and geosphere.

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Residence time

The time energy or matter spends in a reservoir.

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Sequestration

When energy or matter is isolated for very long periods.

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Closed System

Earth is essentially this type of system.

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Matter in a closed system

The amount of matter is fixed and finite

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Life Zone

The zone where Earth's four reservoirs interact most intensively, creating conditions favorable for life.

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Geosphere

The solid part of the Earth, composed mainly of rock and regolith.

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Hydrosphere

The totality of Earth's water, including oceans, lakes, streams, underground water, snow, and ice.

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Atmosphere

The mixture of gases that surrounds the Earth. Predominantly Nitrogen, Oxygen, Argon, Carbon Dioxide and Water.

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Biosphere

Includes all of Earth's organisms and the matter that has not yet decomposed.

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Anthroposphere

The 'human sphere,' comprising people, their interests, and their impacts on the Earth system.

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System Response

All systems respond to inputs due to energy flow, leading to outputs.

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Feedback

A response where the system's output serves as an input, influencing its own behavior.

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Negative Feedback

System response in the opposite direction of the initial input, often self-limiting.

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Positive Feedback

Increase in output leads to a further increase in output. Destabilizing and a vicious cycle.

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Cycle

Constant movement of material from one reservoir to another.

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Dynamic Equilibrium

Natural cycles exist in a balance of inputs and outputs.

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Earth Cycles

Cycles that involve the Earth's components

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Hydrologic Cycle

The continuous circulation of water.

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Energy Cycle

The cycling of energy through the Earth system.

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The Rock Cycle

The creation, alteration, and destruction of rocks.

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The Tectonic Cycle

The cycling of Earth's crust.

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Biogeochemical Cycles

Cycling of chemical elements essential for life.

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Human Impact on Cycles

Human actions impacting cycles.

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Global Change

Overall changes to the planet due to human actions.

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The Scientific Method

A method of gathering data and testing it.

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Study Notes

  • Earth System Science is an interconnected approach to studying the Earth.
  • It focuses on Earth as a whole and its interacting components.
  • These components include the ocean, atmosphere, continents, lakes, rivers, soils, plants, and animals.
  • Earth System Science relies on observations of Earth at different scales.
  • Remote sensing with satellites is very useful for making these observations.
  • Geographic Information Systems enable scientists to store and analyze significant data.

Systems

  • A system can be any part of the universe that is isolated to observe and measure changes.
  • Systems can be used to study complex problems.
  • A model is a representation, usually a simplification.
  • The models of processes can represent Earth's systems.
  • A box model is a simple graphical representation of a system that can show the system's essential features.
  • These features include:
    • The processes and rates by which matter or energy enters and leaves the system.
    • The processes and rates by which matter or energy moves within the system.
    • The amount of matter or energy in the system and its distribution.
  • An important aspect of the Earth system is measuring how volumes and exchanges of materials and energy between Earth's reservoirs change over time.
  • There is a challenge to determine why the changes happen and how quickly they happen.
  • The amount of energy or matter that is transferred is called flux.
  • Reservoirs are places where energy or matter is stored.
  • If the flux into a reservoir is greater than the flux out, that reservoir is a sink.
  • If the flux into a reservoir is less than the flux out, that reservoir is a source.
  • Residence time is the length of time energy or matter spends in a reservoir.
  • Sequestration is when matter is isolated for very long periods.
  • Earth has four reservoirs with constant flows of energy and matter among them.
  • These reservoirs are the atmosphere, hydrosphere, biosphere, and geosphere.
  • Earth is considered a closed system.
  • Two implications of Earth being a closed system are:
    • The amount of matter is fixed and finite.
    • If changes are made in one part of a closed system, the results of the change will affect other parts of the system.

Earth System Reservoirs

  • The life zone is a narrow zone where Earth’s four reservoirs interact intensively.
  • Conditions favorable for life are created by interactions between the lithosphere, hydrosphere, and atmosphere.
  • These conditions are modified by the biosphere.

The Geosphere

  • The geosphere is the solid Earth.
  • It is composed mainly of rock and regolith.
  • The geosphere is where energy from outside the Earth system meets energy from within the planet.
  • Energy sources combine and compete to build up and wear down the materials of Earth's surface.

The Hydrosphere

  • The hydrosphere is the totality of Earth's water.
  • It includes oceans, lakes, streams, underground water, and all snow and ice.
  • The perennially frozen parts of the hydrosphere are collectively the cryosphere.
  • The hydrosphere and the atmosphere store, purify, and continually redistribute water.

The Atmosphere

  • The atmosphere is the mixture of gases that surrounds Earth.
  • It predominantly contains Nitrogen (Ni), Oxygen (O2), Argon (Ar), Carbon Dioxide (CO2), and Water (H2O).
  • In the planetary context, it is a thin layer that protects life from damaging solar radiation.
  • The atmosphere is a reservoir for oxygen and carbon dioxide.
  • It is the outer boundary of the Earth system.

The Biosphere

  • The biosphere includes all of Earth's organisms and matter that has not yet decomposed.
  • The biosphere greatly affects every other of Earth's systems.
    • Photosynthesis.
    • Oxygen as a highly reactive gas.

The Anthroposphere

  • The anthroposphere is the "human sphere".
  • It comprises people, their interests, and their impacts on the Earth system.
  • It is the part of the natural system that has been modified by humans.
  • The anthroposphere includes the technosphere, specifically:
    • technology
    • machines
    • the built environment

Dynamic Interactions Among Reservoirs

  • Because energy flows freely into and out of systems, all systems respond to inputs and have outputs.
  • Feedback, a special kind of response, occurs when the output of the system also serves as an input.
    • Negative feedback is when the system's response is in the opposite direction of initial input.
      • It's often self-limiting or self-regulating.
    • Positive feedback occurs when an increase in output leads to a further increase in output.
      • It is a vicious cycle.
      • It is destabilizing.
  • A cycle is the constant movement of material from one reservoir to another.
  • Natural cycles are not simple and exist in a state of dynamic equilibrium.
  • Earth cycles are very important.
    • The Hydrologic Cycle.
    • The Energy Cycle.
    • The Rock Cycle.
    • The Tectonic Cycle.
    • Biogeochemical Cycles.
  • Humans involve or affect natural cycles.
  • Significant changes are now taking place in many Earth reservoirs, and as a result, many are changing in unexpected ways.
  • Global change is a term scientists coined to describe changes produced in the Earth system as a result of human activities.

How Science Works

  • Earth system science, like all other forms of science, advances by application of the scientific method.
  • The scientific method is based on observations and the systematic collection of evidence that can be seen and tested by anyone with resources.
  • Scientists start with an observation and seek to acquire evidence about it through measurement and experimentation.
  • Scientists try to explain their observations by developing a hypothesis.
  • Once an hypothesis has been examined and found to make successful predictions and withstand numerous tests, it may become a theory.
  • Eventually, a theory or group of theories whose applicability has been decisively demonstrated, may become a law or a principle.
  • The fact that nothing is absolutely certain in nature is not problematic for scientists, but can be difficult for non-scientists to comprehend fully.
  • It is important to understand that uncertainty does not imply a lack of scientific knowledge or understanding.

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