chapter 4 vocabualry
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| Core | Earth's center, where pressures and temperatures are very high
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| Mantle | The section of Earth's interior that lies above the outer core and has the most mass
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| Plate tectonics | The theory that earth's crust is divided into rigid plates that slowly move across the upper mantle.
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| Continental drift | The process by which earth's plates slowly move across the upper mantle.
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| rift valley | places on earth's surface where the crust stretches until it breaks.
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| abyssal plains | Areas of the ocean floor where rocks gradually sink because they have no supporting heat below them;the world's flattest and smoothest regions,
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| continental shelves | Areas where continental surfaces extend under the shallow ocean water around the continents.
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| trench | a deep valley marking a collision of plates, where one plates slides under another.
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| folds | places where rocks have been compressed into bends by colliding plates.
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| faults | Places where rocks masses have been broken apart and moving away from each other.
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| weathering | the process by which rocks break and decay over time.
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| sediment | small particles of weathered rock
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| erosion | Movement of surface material from one location to another by water, wind, and ice.
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| glaciers | Thick masses of ice, including great ice sheets and bodies of ice that flow down mountains like slow rivers.
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| plateau | An elevated flatlands that rises sharply above nearby land on at least one side
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| alluvial fan | Fan-shaped deposit of mud and gravel often alng the bases of mountains.
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| delta | Accumulation sediments at the mouth of a river.
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