canyon canyon: a deep ravine between cliffs often carved from the landscape by a river over a long...
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canyon
canyon: a deep ravine between cliffs often carved from the landscape by a river over a long period of time
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delta
delta: a large, flat area of land at the mouth of a river
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landform
landform: a natural structure on Earth’s surface
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dune
dune: a hill of sand that is deposited by the wind
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weathering
weathering: the various processes that cause exposed rock to break down
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physical weathering
physical weathering: the breakdown of rocks and soils through direct contact with heat, water, or ice
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erosion
erosion: the movement of weathered materials by
water, wind, or ice
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deposition
deposition: the process in which materials eroded by water, wind, or ice are dropped in a new place
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mass movement: the downhill movement of rock and soil because of gravity
mass movement
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sedimentary rock: a rock that formed when sediments were pressed and cemented together
sedimentary rock
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cementing: sediments glued together by minerals dissolved in water
cementing
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fossil: a remnant or trace of an organism from long ago, such as a skeleton or leaf imprint, embedded and preserved on the Earth’s crust
fossil
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fossil fuel: a fuel that formed from the decayed remains of ancient plants and animals
fossil fuel
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alternative energy: any energy from a source that does not use up the Earth’s natural resources or endanger our environment
alternative energy
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solar energy: energy from the sun that is converted into thermal or electrical energy
solar energy
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wind energy: air in motion
wind energy
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hydroelectric energy: electricity that is generated by water power
hydroelectric energy
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geothermal energy: energy from within the Earth
geothermal energy
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biofuels: fuels that can be produced using organic materials made from plants and animals
biofuels
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force: a push or pull
force
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gravity: the force that pulls objects toward each other
gravity
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friction: a force between two surfaces rubbing against each other; friction works against motion
friction
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magnetism: a force that pulls magnetic materials across a distance
magnetism