Earth Science: Geosphere and Seismic Waves
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Earth Science: Geosphere and Seismic Waves

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Questions and Answers

What is the primary impact of invasive species on ecosystems?

  • High reproductive success and competition for resources (correct)
  • Enhanced growth of local species and vegetation
  • Improved biodiversity and habitat stability
  • Decreased soil erosion and water quality
  • Which factors contribute to the challenge of managing urban salinity?

  • Invasive plant species and soil erosion
  • Excessive rainfall and heavy flooding
  • Increased agricultural activities and pesticides
  • Leaking stormwater channels and septic tanks (correct)
  • What describes the Indian Ocean Dipole?

  • A stable climate condition with minor seasonal changes
  • A consistent pattern of rainfall in Northern Australia
  • An irregular change in sea surface temperature across the Indian Ocean (correct)
  • A phenomenon that only affects terrestrial ecosystems
  • Which of the following statements accurately describes osmosis?

    <p>Movement of water molecules across a semi-permeable membrane</p> Signup and view all the answers

    What is classified as an abiotic factor in an ecosystem?

    <p>Soil composition and water availability</p> Signup and view all the answers

    What process describes the transition of water from a liquid to a gas due to heat from the sun?

    <p>Evaporation</p> Signup and view all the answers

    Which of the following represents the horizontal movement of a mass of fluid?

    <p>Advection</p> Signup and view all the answers

    What is the primary source of energy for Earth?

    <p>Sun</p> Signup and view all the answers

    How is conduction defined in terms of energy transfer?

    <p>Transfer of energy through contact</p> Signup and view all the answers

    Which of the following practices can help in preventing soil erosion?

    <p>Planting vegetation</p> Signup and view all the answers

    What describes the resistance of a fluid to changes in its surface area?

    <p>Surface tension</p> Signup and view all the answers

    Which phenomenon involves the redistribution of salts in urban environments?

    <p>Urban salinity</p> Signup and view all the answers

    Which term best describes the water that seeps into underground saturated zones?

    <p>Groundwater</p> Signup and view all the answers

    Which method does NOT contribute to preventing soil erosion?

    <p>Conducting excavation</p> Signup and view all the answers

    What is the law of superposition primarily used to determine?

    <p>The relative age of sedimentary rocks</p> Signup and view all the answers

    Which of the following describes a divergent plate boundary?

    <p>Two plates move away from each other</p> Signup and view all the answers

    What phenomenon involves the sinking of water due to increased density?

    <p>Downwelling</p> Signup and view all the answers

    What is a characteristic of fossil fuels?

    <p>Non-renewable energy sources from ancient organic matter</p> Signup and view all the answers

    Which type of fault occurs when the hanging wall moves down relative to the foot wall?

    <p>Normal fault</p> Signup and view all the answers

    What characteristic is associated with the theory of continental drift?

    <p>Continents were once joined and have since drifted apart</p> Signup and view all the answers

    Which of the following statements about the rock cycle is true?

    <p>The rock cycle is a continuous process involving different rock types</p> Signup and view all the answers

    What is the primary difference between P waves and S waves in terms of their travel capabilities?

    <p>P waves can travel through all states of matter, while S waves can only travel through solids.</p> Signup and view all the answers

    Which type of rock forms when sediment is compacted and cemented?

    <p>Sedimentary</p> Signup and view all the answers

    What defines felsic minerals in igneous rocks?

    <p>They contain the most silica.</p> Signup and view all the answers

    What is the primary use of the difference in arrival times between P and S waves?

    <p>To determine the distance to the epicenter of an earthquake.</p> Signup and view all the answers

    Which of the following is a characteristic of non-silicate minerals?

    <p>Does not include silicon-oxygen units.</p> Signup and view all the answers

    Which scale is used to determine the hardness of minerals?

    <p>Mohs Scale</p> Signup and view all the answers

    What does the process of relative dating rely on?

    <p>Physical relationships of geologic structures.</p> Signup and view all the answers

    What is the primary characteristic that differentiates metamorphic rocks from the other types?

    <p>Formed under high heat and pressure.</p> Signup and view all the answers

    Study Notes

    • Geosphere: The solid rock layer of Earth, including rocky materials.
    • Hydrosphere: Total water content on Earth, including liquid, ice, and vapor.
    • Atmosphere: Mixture of gases surrounding Earth, essential for life.
    • Biosphere: Region containing all living organisms, encompassing plants, animals, and bacteria.
    • Lithosphere: The solid outer layer of Earth.

    Seismic Waves

    • P Waves (Primary Waves): Fastest seismic waves, travel through solids, liquids, and gases; first to reach seismic instruments.
    • S Waves (Secondary Waves): Slower than P waves; only travel through solids; their arrival time difference helps locate faults.

    Minerals

    • Silca: A hard, colorless compound found in quartz and sandstone.
    • Silicate Minerals: Contain silicon and oxygen; form salts or esters derived from silicic acid.
    • Non-Silicate Minerals: Lack characteristic silicon-oxygen units.
    • Felsic Minerals: Rich in feldspar and quartz; high silica content in igneous rocks.
    • Mafic Minerals: Rich in iron and magnesium; lower silica content.

    Rock Formation Types

    • Igneous Rocks: Formed from crystallization of molten rock (e.g., obsidian, pumice).
    • Sedimentary Rocks: Created from compacted and cemented sediments (e.g., sandstone, limestone).
    • Metamorphic Rocks: Result from heat and pressure altering existing rocks (e.g., quartzite, marble).

    Dating Methods

    • Relative Dating: Determines approximate age based on physical relationships within geological structures.
    • Absolute Dating: Calculates the actual age using measurements like radiocarbon dating.

    Soil Composition and Erosion Prevention

    • Soil Layers: Organic matter, topsoil, subsoil, parent material, bedrock.
    • Soil Erosion Prevention Techniques: Stock rotation, pest control, effective landscaping in high-risk areas, paving water channels, tree planting for root stability.

    Geological Concepts

    • Geological Time Scale: Framework for understanding Earth's geological history.
    • Plate Tectonics: Movement of Earth's lithosphere divided into major and minor tectonic plates.
    • Wegener's Theory: Continental drift theory; continents fit together like puzzle pieces.

    Plate Boundaries and Fault Types

    • Divergent Boundaries: Plates move apart, creating new surfaces.
    • Convergent Boundaries: Plates collide, leading to subduction and mountain formation.
    • Transform Boundaries: Plates slide past each other, causing earthquakes.
    • Normal Faults: Block above the fault moves downward.
    • Reverse Faults: Hanging wall moves upward over the foot wall.

    Energy Transformations

    • Convection Currents: Fluid movements due to temperature or density changes; important in air, ocean, and mantle dynamics.
    • Thermohaline Circulation: Ocean current movement driven by temperature and salinity differences.
    • Sun: Main energy source for Earth, driving many natural processes.

    Water Movement and Cycles

    • Evaporation: Transition of water from liquid to gas.
    • Precipitation: Returns liquid or frozen water to Earth.
    • Transpiration: Water vapor release from plant leaves.
    • Osmosis: Movement of water molecules across membranes.

    Soil Management Strategies

    • Urban Salinity: Effects of urban areas on salt distribution.
    • Dryland Salinity: Consequences of removing deep-rooted plants.
    • Irrigation Salinity: Increased surface salt rise due to poor irrigation practices.
    • Invasive Species: Non-native organisms that disrupt local ecosystems and can cause ecological harm.

    Major Environmental Challenges

    • Lead Contamination: The largest soil contaminant issue.
    • Human Impacts: Urban development and agricultural practices contribute to soil and water quality degradation.
    • Managing Salinization: Includes restoring deep-root plants and improving irrigation systems.

    Climate Influences

    • Indian Ocean Dipole: Affects sea surface temperature variations between ocean sides.
    • Madden-Julian Oscillation: Influences rainfall patterns across equatorial regions in Australia.

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    Description

    Explore the fascinating layers of Earth including the geosphere, hydrosphere, atmosphere, biosphere, and lithosphere. Assess your understanding of seismic waves, such as P waves and S waves, their characteristics, and their significance in Earth science. Test your knowledge now!

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