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Plate Tectonics

Lithosphere Rigid outer part of the Earth, consisting of the crust and upper mantle.
Plates Each of the several rigid pieces of the Earth's lithosphere that together make up the Earth's surface.
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.
Continental Drift The gradual movement of the continents across the Earth's surface thought geological time.
Pangea Supercontinent that existed during the late Paleozoic and early Mesozoic eras.
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.
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.
Subduction The sideways and downward movement of the edges of a plate of the Earth's crust into the mantle beneath another plate.
Convergent Boundaries Tectonic plates or fragments of the lithosphere move toward one another and collide.
Divergent Boundaries Two tectonic plates that move away from each other.
Transform Fault Boundaries Two plates that slide past each other.
Mid-Ocean Ridge Ridge in the middle of the ocean
Trenches A long, narrow, deep depression in the ocean floor. Typically one running parallel to a plate boundary and marking a subduction zone.
Spreading Center A linear zone in the sea floor along which magma rises and from which adjacent crustal plates are moving apart.
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.
Deep Ocean Trench Deep trench in the ocean.
Volcanic Island Arc Result from the subduction of an oceanic tectonic plate and often parallel to an oceanic trench.
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.
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.
Created by: probinson28