Plate Tectonics
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| Lithosphere | Rigid outer part of the Earth, consisting of the crust and upper mantle.
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| Plates | Each of the several rigid pieces of the Earth's lithosphere that together make up the Earth's surface.
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| Asthenosphere | Upper layer of Earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
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| Continental Drift | The gradual movement of the continents across the Earth's surface thought geological time.
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| Pangea | Supercontinent that existed during the late Paleozoic and early Mesozoic eras.
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| Oceanic Ridge System | A long, seismically active submarine ridge system situated in the middle of an ocean basin and marking site of the upwelling of magma associated wi sea floor spreading.
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| Sea Floor Spreading | The formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid-ocean ridges and its subsequent outward movement on either side.
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| Subduction | The sideways and downward movement of the edges of a plate of the Earth's crust into the mantle beneath another plate.
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| Convergent Boundaries | Tectonic plates or fragments of the lithosphere move toward one another and collide.
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| Divergent Boundaries | Two tectonic plates that move away from each other.
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| Transform Fault Boundaries | Two plates that slide past each other.
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| Mid-Ocean Ridge | Ridge in the middle of the ocean
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| Trenches | A long, narrow, deep depression in the ocean floor. Typically one running parallel to a plate boundary and marking a subduction zone.
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| Spreading Center | A linear zone in the sea floor along which magma rises and from which adjacent crustal plates are moving apart.
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| Rift Valley | A large elongated depression with steep walls formed by the downward displacement of a block of the Earth's surface between nearly parallel faults or fault systems.
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| Deep Ocean Trench | Deep trench in the ocean.
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| Volcanic Island Arc | Result from the subduction of an oceanic tectonic plate and often parallel to an oceanic trench.
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| Constructive Forces | Processes that help build up the Earth, either by depositing soil or silt in a river, or by volcanoes and lave flows that generated new land.
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| Destructive Forces | Processes that break down the Earth, either thought the violent actions of volcanoes and earthquakes or by the steady flow of a river.
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Created by:
probinson28
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