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Unit 3 vocab,Alex C

Plate Tectonics

TermDefinition
Asthenosphere the upper layer of the earth's mantle that's under the lithosphere
Subduction two plates colliding then the denser plate descends below the less dense plate
Seafloor spreading theory that explains how new oceanic crust is formed at ocean ridges
Mantle convection
Ridge Push the weight of the uplifted ridge to push the oceanic plate toward the trench formed at the subduction zone
Slab pull the weight of the relatively cool dense subtucting plate pulls the trailing slab into the subduction
Lava magma that flows out the earth's surface
Magma molten rock below the earth's surface
Tectonic plate huge pieces of crust and the upper mantle that fit tpgether to cover earth's surface
Theory of continental drift theory that states earth's continents have been joined as a single land mass to make supercontinent named pangea
Convergent boundary regions where two tectonic plates moving toward each other
Divergent boundary regions where two tectonic plates are moving apart
Hot spot hot regions or earth's mantle where hot plumes of magma rises to the surface
Epicenter point of earth's surface directly above the focus
Focus point of failure where the waves of the earthquake originate from
Pangea all of earth's continents together forming a single land mass making a super continent
Geohazard geological condition that could lead to damage or risk of injury's like earthquakes
Reverse fault horizontal and vertical compressions that squeezes rock and shortens the crust
Strike-slip fault shear causes horizontal movement along a fault plane like the san andreas fault
Normal fault fracture or systme of fractures along earth's tectonic plates when they move
Compression stress that decreases the volume of a material
Tension stress that pulls a material apart
Shearing stress that causes a material to twist
Felsic igneous rock realative to a group of light-colored minerals or rocks
Mafic igneous rock realative to a group of dark colored minerals or rocks
Created by: Alex C.