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Questions and Answers
What does the term 'absolute location' refer to?
What does the term 'absolute location' refer to?
The exact location of a place on Earth, as described by global coordinates.
Define 'relative location'.
Define 'relative location'.
The position of a place in relation to another place.
What is 'place' in geographical terms?
What is 'place' in geographical terms?
A specific point on Earth distinguished by a particular character.
Explain the concept of 'region'.
Explain the concept of 'region'.
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What does 'movement' signify in geography?
What does 'movement' signify in geography?
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Describe 'human-earth relationships'.
Describe 'human-earth relationships'.
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Define 'process' in a geographical context.
Define 'process' in a geographical context.
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What is 'systems' in geography?
What is 'systems' in geography?
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What is a 'positive feedback loop?'
What is a 'positive feedback loop?'
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What is 'Pleistocene'?
What is 'Pleistocene'?
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What is 'Holocene'?
What is 'Holocene'?
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Define 'Cartography'.
Define 'Cartography'.
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What is 'distortion' in cartography?
What is 'distortion' in cartography?
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What is 'scale' in cartography?
What is 'scale' in cartography?
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What is 'operational scale'?
What is 'operational scale'?
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What is the 'Mercator Projection'?
What is the 'Mercator Projection'?
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Explain the 'Gall-Peters Projection'.
Explain the 'Gall-Peters Projection'.
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Describe the 'Goode Homolosine Projection'.
Describe the 'Goode Homolosine Projection'.
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What is an 'Azimuthal Projection'?
What is an 'Azimuthal Projection'?
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What is a 'Tissot's Indicatrix'?
What is a 'Tissot's Indicatrix'?
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What is 'GPS'?
What is 'GPS'?
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What is 'remote sensing?'
What is 'remote sensing?'
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Define 'Aphelion' in relation to Earth's orbit.
Define 'Aphelion' in relation to Earth's orbit.
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What is 'Perihelion'?
What is 'Perihelion'?
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What is the 'speed of light?'
What is the 'speed of light?'
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Define 'solar cycle'.
Define 'solar cycle'.
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What are 'sunspots'?
What are 'sunspots'?
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What is a 'solar minimum'?
What is a 'solar minimum'?
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What is 'solar maximum?'
What is 'solar maximum?'
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What is the 'Corona'?
What is the 'Corona'?
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What is the 'Magnetosphere'?
What is the 'Magnetosphere'?
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What is 'Electromagnetic energy?'
What is 'Electromagnetic energy?'
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What is 'insolation'?
What is 'insolation'?
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Define the 'solar constant.'
Define the 'solar constant.'
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What is a 'subsolar point'?
What is a 'subsolar point'?
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What is 'global net radiation'?
What is 'global net radiation'?
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What is 'sun altitude?'
What is 'sun altitude?'
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What is meant by 'solar noon?'
What is meant by 'solar noon?'
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Explain what 'sun declination' is?
Explain what 'sun declination' is?
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What is a 'circle of illumination'?
What is a 'circle of illumination'?
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What is an 'ecliptic?'
What is an 'ecliptic?'
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What is meant by 'axial tilt?'
What is meant by 'axial tilt?'
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What are the different layers of the atmosphere?
What are the different layers of the atmosphere?
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What is 'air pressure?'
What is 'air pressure?'
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What is 'atmospheric pressure?
What is 'atmospheric pressure?
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Define 'Heteroshpere.'
Define 'Heteroshpere.'
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What are the 'constant gases' of the atmosphere?
What are the 'constant gases' of the atmosphere?
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What are the 'variable gases' of the atmosphere?
What are the 'variable gases' of the atmosphere?
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What is the 'greenhouse effect?'
What is the 'greenhouse effect?'
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What are the 'anthropogenic greenhouse gases'?
What are the 'anthropogenic greenhouse gases'?
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What is the 'ozone layer?'
What is the 'ozone layer?'
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What are some examples of 'natural pollution?'
What are some examples of 'natural pollution?'
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Provide examples of 'anthropogenic pollution.'
Provide examples of 'anthropogenic pollution.'
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Define 'aerosol.'
Define 'aerosol.'
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What is meant by 'transmission' in relation to energy?
What is meant by 'transmission' in relation to energy?
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What is 'scattering' of energy?
What is 'scattering' of energy?
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What is 'diffuse radiation?'
What is 'diffuse radiation?'
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What is 'refraction'?
What is 'refraction'?
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What is a 'mirage'?
What is a 'mirage'?
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What is 'Rayleigh scattering'?
What is 'Rayleigh scattering'?
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What is 'Mie scattering?'
What is 'Mie scattering?'
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What is 'albedo?'
What is 'albedo?'
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Study Notes
Five Themes of Geography
- Location: Exact location described by global coordinates or relative location in relation to another place.
- Place: A specific point on Earth distinguished by a unique characteristic.
- Region: An area with a unique combination of trends or features.
- Movement: The flow of things, people, and ideas.
- Human-Earth Relationships: The impacts of the environment on people and their impact on the environment.
Systems
- Systems: A collection of subsystems that combine to create equilibrium, which can be changed under extreme stress.
- Positive Feedback Loop: A feedback loop where changes in a system are amplified.
- Negative Feedback Loop: A feedback loop where changes in a system are decreased or return to the original state.
Time Periods
- Pleistocene: The last major Ice Age, from 2.6 million years ago to about 11,700 years ago.
- Holocene: The geological epoch since the end of the Great Ice Age, about 11,000 years ago.
- Anthropocene: A proposed modern geological epoch during which humans have significantly affected the environment, resulting from large populations and technological advancements.
Geography
- Cartography: The science or art of mapmaking.
- Distortion: Changes in shape, size, or position of a place when shown on a map.
- Scale: The ratio of a map distance to the corresponding ground distance.
- Operational Scale: The scale at which social or natural processes are investigated.
- Mercator Projection: A map projection of the Earth onto a cylinder, accurately showing shape and direction, but distorting relative sizes.
- Goode Homolosine Projection: A map projection that shows the relative sizes of continents accurately but interrupts the oceans to represent a sphere.
Earth's Systems
- Gall-Peters Projection: A map projection that accurately shows the relative sizes of continents.
- Azimuthal Projection: A map projection projecting a region of the Earth onto a plane that's tangent to a pole or the equator.
- Tissot's Indicatrix: Circles used to visualize map projection distortions
Sun Characteristics & Variables
- Aphelion: The point in Earth's orbit where it's furthest from the Sun (94.5 million miles).
- Perihelion: The point in Earth's orbit where it's closest to the Sun (91.5 million miles).
- Speed of Light: 300,000 km/sec (186,000 miles/sec).
- Solar Cycle: Periodic variations in the Sun's magnetic activity and appearance (sunspots).
- Solar Minimum: When sunspot activity is lowest
- Solar Maximum: When sunspot activity is highest.
- Corona: The outermost layer of the Sun's atmosphere.
- Magnetosphere: The area surrounding Earth influenced by Earth's magnetic field.
- Electromagnetic energy: All energy traveling in waves through space, including light, heat, x-rays, radar, and radio waves; classified by wavelength.
Atmosphere
- Insolation: Incoming solar radiation.
- Solar Constant: The average insolation received at the top of the atmosphere when Earth is at its average distance from the Sun.
- Subsolar Point: The point on Earth where the Sun's rays strike vertically.
- Global Net Radiation: The difference between incoming and outgoing radiation.
- Sun Altitude: Position of the Sun relative to the horizon.
- Solar Noon: The time of day when the Sun is highest in the sky
- Sun Declination: Latitude of the subsolar point.
- Circle of Illumination: The dividing line between day and night.
- Ecliptic: The plane of Earth's orbit around the Sun..
- Axial Tilt: The angle at which Earth's axis tilts (23.5 degrees).
- Layers of the Atmosphere: Troposphere, stratosphere, mesosphere, thermosphere, exosphere.
- Air pressure: The force exerted by the mass and motion of air particles (lower at higher altitudes)
- Atmospheric Pressure: The force exerted on Earth's surface by the weight of the air above.
- Heterosphere: The upper layer of Earth's atmosphere where gases are layered according to atomic weight.
- Constant Gases: Nitrogen, Oxygen, and Argon
- Variable Gases: Water vapor, and carbon dioxide.
- Greenhouse Effect: The process by which greenhouse gases trap heat in the atmosphere.
Atmospheric processes
- Transmission: Unimpeded movement of electromagnetic energy through a medium.
- Scattering: The change in direction of radiation by particles in the atmosphere.
- Diffuse Radiation: Energy that reaches the Earth's surface after being scattered.
- Direct Radiation: Energy that reaches the Earth's surface unscattered
- Refraction: Bending of radiation as it passes through a medium (mirage is an example).
- Rayleigh Scattering: Gas molecules scattering shorter wavelengths more than longer wavelengths, causing the sky to appear blue.
- Mie Scattering: Scattering by particles larger than visible wavelengths, causing the sky to appear white.
- Albedo: The ability of a surface to reflect light. Lower sun altitude=more absorption.
- Urban Heat Island (UHI): A metropolitan area that's significantly warmer than its surrounding rural areas due to human activities
Temperature and Pressure
- Elevation: Height of a point on Earth's surface above sea level.
- Altitude: Distance between an airborne object and Earth's surface; higher altitudes are generally colder.
- Lapse Rate: The rate at which air temperature falls with increasing altitude.
- Snowline: Elevation above which there is permanent snow.
- Marine Effect: Slow heating and cooling of oceans keep coastal temperatures more stable
- Continental Effect: Areas far from oceans have larger temperature ranges.
- Cold Snap: A rapid decrease in temperature.
- Heat Wave: A prolonged period of abnormally hot weather.
- Wind Chill: Chilling caused by convection of heat away from the body in the presence of wind
- Heat Index: A measure of how hot the temperature feels based on humidity.
- Pressure Gradient Force (PGF): High-pressure (denser) air moving to areas of lower pressure, caused by uneven heating.
- Isobar: A line on a weather map connecting points of equal atmospheric pressure
- Coriolis Force: An apparent force that deflects air or water movement due to the Earth's rotation (right in the Northern Hemisphere and left in the Southern Hemisphere).
- Friction Force: Resistance to wind flow near the ground.
- Cyclone: The rotation of air inward toward a low-pressure point (counterclockwise in the Northern Hemisphere and clockwise in the Southern).
- Primary Circulation: Air flow patterns at a continental scale
- Secondary Circulation: Air flow patterns at regional or local scales.
Atmospheric Circulation
- Hadley Cell: Convection currents that cycle between the equator and 30 degrees latitude North and South.
- Ferrel Cell: A cell that moves air from 30 degrees to 60 degrees latitude.
- Polar Cell: A weak circulation cell between 60 and 90 degrees latitude.
- Primary Pressure Areas: Equatorial Low, Subtropical High, Subpolar Low, Polar High
- Trade Winds: Reliable winds converging at the ITCZ.
- Subtropical High: A belt of high pressure (approximately 30°N and 30°S), pushing air southward (and northward).
- Westerlies: Dominant winds of the mid-latitudes, moving from west to east.
- Subpolar Low: A belt of low air pressure at approximately 60°N and 60°S latitude, characterized by wet conditions and low temperatures.
- Polar Front: Boundary where cold polar air meets warmer mid-latitude air.
- Polar High: A dome of high pressure centered over the poles, characterized by cold and dry conditions.
- Polar Easterlies: Weak, variable winds moving to in an anticyclonic direction.
- Geostrophic Wind: A wind that moves parallel to the isobars (resulting from a balance between pressure-gradient force and the Coriolis effect).
- Rossby Waves: Geostrophic winds along the polar front.
- Jet Streams: Irregular, concentrated bands of westerly winds (occur at several levels).
- Land and Sea Breezes: Local winds caused by different heating of land and water.
Other Atmospheric Processes
- Rain Shadow Effect: A phenomenon where air cools and loses moisture on one side of a mountain, leading to arid conditions on the other side (leeward side).
- Santa Ana Winds: Winds flowing over the Rockies to the West Coast.
- Katabatic Winds: Gravity drainage winds that occur on a large scale, under certain conditions.
- Monsoon: A rainy season where warm, moist air is pushed northward.
- Oceanic Currents: Continuous flow of surface ocean water driven by wind, Coriolis effect, tides, density differences due to temp/salinity.
- Gyres: The large, circular current patterns found in each ocean.
- Equatorial Currents: Major currents parallel to the equator driven by weaker Coriolis effect
- Subtropical Currents: Caused by gyres and are stronger, narrower, and deeper than their corresponding eastern boundary currents, due to the Coriolis Effect.
- Upwelling: The movement of deep, cold, nutrient-rich water to the surface because of water being displaced by wind.
- Thermohaline Circulation: An oceanic circulation pattern caused by temperature and salinity differences of water, moving large volumes of water around the globe (Global Conveyor Belt).
- El Niño: A warm phase of oscillation every several years, negatively affecting the upwelling of nutrients, reducing nutrients along the coast.
- La Niña: The opposite of El Niño, but is weaker and less consistent.
Water Cycle & Hydrologic Processes
- Water Budget: The quantity of water within a stream that passes a given point during a set period of time, calculated by multiplying the stream width by stream depth by stream velocity.
- Exotic Stream: A stream that originates elsewhere geographically and flows into an area with little or no precipitation
- Hydrograph: A diagram showing the levels or amount of flow in a river over time.
- Base Flow: Normal flow of a river with no precipitation
- Hydraulic Action: The physical force of a flowing water erodes surrounding materials.
- Abrasion: The process of grinding away of a rock by other rock materials carried within water, ice, or wind.
- Dissolved Load: Dissolved materials in a stream like Sodium or Calcium (not visible).
- Suspended Load: Small rocks and soil in suspension visible in the water-making it appear muddy.
- Bed Load: Sediment carried by a stream along the bottom of its channel; includes traction and saltation
- Traction: The dragging of larger bed load particles along the bottom of the river bed.
- Saltation: The bouncing of smaller bed-load materials along the bottom of a river.
- Degradation: Widening/deepening of a stream channel, occurring during high-flood flow.
- Aggradation: Narrowing/shortening of a stream channel due to sediment deposits.
- Stream Piracy: When one stream captures the headwaters of another stream.
- Meandering Stream: A stream with a curving channel that forms loops (outer edges are steeper).
- Point Bar: Deposit of sediment on the inside bend of a river; due to velocity changes, resulting in sedimentation.
- Oxbow Lake: A formerly meandering channel that's cut off from the main river channel.
- Graded Stream: A stream whose gradient is adjusted to carry its average sediment load.
- Nickpoint: A point in a stream's longitudinal profile that experiences a rapid change in slope, often associated with waterfalls.
- Watershed (Drainage Basin): The land area from which surface water drains into a particular river, lake, wetland, or other body of water
Soil
- Soil Moisture Zone: The volume of water in soil available to plants.
- Field Capacity: The maximum amount of water held by soil particles against gravity.
- Surface Water Resources: Snow, Ice, Rivers, Lakes, Wetlands.
- Snowpack: The accumulation of winter snowfall, especially in mountain or upland regions.
- Base Flow: The sustained flow of a stream in the absence of direct runoff from rain or snowmelt
- Aquifer: Underground layer of sand, gravel, or permeable rock that holds groundwater.
- Artesian Water: Groundwater under pressure, rising above the surrounding water table.
- Influent Source: A water supply source where the water table is lower than the stream, and the water feeds into it.
- Effluent Source: A water supply source where the water table is higher than the stream, and the water flows from the water table into the stream.
- Ground Water Mining: Removing groundwater from aquifers faster than it is replenished.
- Cone of Depression: A lowering of the water table around a pumping well.
- Soil Horizons: Distinct layers within a soil profile (O, A, E, B, C, R).
- O Horizon: Organic horizon at the surface with organic matter
- A Horizon: Topsoil layer that contains the most organic matter.
- E Horizon: Layer where minerals have been dissolved and removed from the soil
- B Horizon: Layer where minerals leached from the E horizon are deposited.
- C Horizon: Layer composed of the weathered parent material, with little organic matter.
- R Horizon: Layer of bedrock that underlies the other soil layers.
- Mollisols: Grassland soils.
- Alfisols: Moderately weathered forest soils.
- Ultisols: Heavily weathered forest soils.
- Soil Color: Portrays the chemical makeup of soils (-Iron Oxides, -Carbonates, Organic Matter).
- Soil Texture: The relative proportions of sand, silt, and clay which determines its moisture retention
- Soil Structure: Arrangement of soil particles into aggregates.
- Soil Consistency: Measures a soil's resistance to breaking, determining its moisture level.
- Hydric Soils: Soils which are permanently or seasonally saturated by water
- Soil Erosion: the loss of topsoil due to various human activities
- Desertification: Land degradation in drylands due to numerous factors like overgrazing, excessive crop planting, deforestation.
- Oxisols: Subtropical or tropical soils with high iron and aluminum content (low fertility).
- Aridsols: Desert soils with low moisture and organic matter; prone to salinization.
Climate and Weather
- Environmental Lapse Rate: Rate at which air temperature falls with increasing height in the troposphere.
- Dry Adiabatic Rate: Rate of cooling or heating of unsaturated air. Moist Adiabatic Rate: Rate that saturated air cools or heats.
- Lifting Condensation Level: Altitude at which rising air becomes saturated and condensation starts.
- Stable Atmospheric Conditions: Environmental lapse rate lower than both the dry and moist adiabatic rate.
- Fog: A cloud that forms near or on the ground
- Radiation Fog: Ground cools air below the dew-point temperature on calm clear nights.
- Advection Fog: Unsaturated air passes over a cooler surface, and it becomes saturated
- Evaporation Fog: When air in contact with a warm surface becomes saturated
- Continental Polar air masses: cold and dry.
- Convergent Lifting: Air flows and is forced upwards, caused by low pressure.
- Convectional Lifting: When air heats and rises.
- Orographic Lifting: Air forced up a mountain.
- Rain Shadow Effect: Dry conditions on the leeward side of a mountain range, due to orographic precipitation processes.
- Frontal Lifting: Air is pushed upward along fronts with different temperatures.
- Fronts: Boundary between different air masses, usually associated with precipitation.
- Midlatitude Cyclones: Result of cold and warm air meeting.
- Squall Lines: Narrow bands of high winds and storms formed by the collision of two different air masses.
- Derecho: Straight-line wind from severe thunderstorms.
- Wind Shear: Difference in wind speed or direction.
- Outgassing: Water vapor emerging from within or below Earth's crust
- Eustasy: Changes in sea level caused by variations in ocean water volume
- Glaco-eustasy: Changes in sea level due to variations in ice sheet volume.
- Hydrologic Cycle: Continuous flow of water around the world in different states (solid, liquid, gas): evaporation, precipitation, transpiration.
- Transpiration: Water movement from plants to the atmosphere.
- Overland Flow: Water flow over the land's surface.
- Infiltration: Process by which water soaks into the surface through soil
- Interception: Precipitation on vegetation rather than ground.
- Streamflow: Water flowing into streams and rivers
- Percolation: Infiltration into the ground.
- Pedon: Smallest unit of soil.
Earth's Internal Processes
- Geomorphology: The study of the surface features of Earth, their origins, and developments over time.
- Superposition: The principle that in undisturbed rock layers, younger rocks lie above older rocks (layers).
- Uniformitarianism: The principle that geologic processes that occur now are the same as those that have occurred in the geological past.
- Radiometric Dating: Dating method using decay of radioactive isotopes.
- Earth's Age: Estimated to be 4.6 billion years old.
- Moho: Boundary between Earth's crust and mantle.
- Continental Crust: The layer of the crust beneath land.
- Oceanic Crust: The layer of crust beneath the ocean.
- Lithosphere: Earth's rigid outer layer (includes the crust and upper mantle).
- Asthenosphere: Layer beneath the lithosphere, which deforms and flows under stress, allowing the movement of Earth's plates.
- Mineral: An inorganic substance of natural occurrence, having a specific formula, crystalline structure, and defining characteristics.
- Clasts: Small pieces or fragments of a rock.
Rocks & Processes
- Lithification: Process that converts sediments into solid rock by compaction or cementation.
- Continental Drift: Gradual movement of continents across the Earth's surface over geological time.
- Seafloor Spreading: Process where new oceanic crust forms along a mid-ocean ridge and older crust moves away from the ridge.
- Subduction: One plate going under another plate, often associated with deep ocean trenches and volcanism.
- Convergent Boundary: Where two plates move toward each other (often associated with mountains, volcanism).
- Divergent Boundary: Where two plates move away from each other (often associated with mid-ocean ridges),
- Transform Boundary: Where two plates slide past each other (associated with faults and earthquakes).
- Fault: A break in the Earth's crust where rocks have moved past each other.
- Fluvial Processes: Processes involving the work of flowing water on Earth's surface.
- Erosion: Removal and transport of materials by natural forces such as water, wind, or ice
- Deposition: Process of settling or dropping sediment into a new location
- Watershed (Drainage Basin): The land area from which water drains into a particular river, lake, wetland, or other body of water.
- Sheetflow: Surface water flow not concentrated in channels.
- Rill: Small channels where water flows
- Continental Divide: Ridge that separates different drainage basins
Other
- Homosphere: Lower layer of Earth's atmosphere (0-80 km), containing evenly mixed gases.
- Anticyclones: Rotation of air outward from a high-pressure point (clockwise in North, counter clockwise in South).
- Horse Latitudes: Belts of calm air and sea occurring in both hemispheres between the trade winds and the westerlies.
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