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FINAL 2: Tectonics

8th Grade Earth Science FINAL 2

What is the Theory of Plate Tectonics? (3 parts) Earth’s crust & upper mantle are broken into plates and move around on a layer of the mantle (asthenosphere). There are Seven Major Plates, they interact at plate boundaries. The plates move very slowly.
What is the evidence that supports the Theory of Plate Tectonics? This theory is built on all of the evidence for Continental Drift, Seafloor Spreading, and the better understanding of how volcanoes, earthquakes, and mountains are located & created.
What are the characteristics & features of Convergent plate boundaries? -Plates collide -Oceanic plate sink under a continental plate (subduction) = a deep ocean trench. -(Destructive Boundary) -Oceanic plates converge = volcanic island arc. -Continental plates converge & crumple = folded mountains.(Collision Boundary)
What are the characteristics & features of Divergent plate boundaries? Divide. Seafloor spreading occurs forming midocean ridges. New crust is formed (Constructive Boundary).
What are the characteristics & features of Transform plate boundaries? Two plates slide past each other. Move at different rates. Also known as strike-slip faults (Conservative Boundary).
What causes the tectonic plates to move (in theory)? Convection currents: hot magma rises up and cool rock sinks below. The magma moves the plates along with it.
Created by: *BROOKE*
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