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Plate Tectonics

QuestionAnswer
Alfred Wegner's theory that the continents slowly moved over Earth's surface to their current locations. CONTINENTAL DRIFT
Earth's crust and upper mantle are broken into sections that continents and ocean floors are carried on. PLATES
Two plates SLIP past each other (earthquakes can occur). TRANSFORM BOUNDARY
An underwater mountain chain that extends into all of the oceans on Earth. MID-OCEAN RIDGE
Solid layer of Earth made of the crust and part of the upper mantle. LITHOSPHERE
The plates of the lithosphere float and move around on the _____________, which is made of solid rock that flows like a thick liquid. ASTHENOSPHERE
Old crust is pushed downward and sinks in the mantle. SUBDUCTION
Deep crack running down the center of the Mid-Atlantic ridge. RIFT VALLEY
Process that slowly adds new rock to the ocean floors. SEA-FLOOR SPREADING
The movement of a gas or liquid caused by differences in temperature. CONVECTION CURRENTS
Two plates move APART (rift valley and mid-ocean ridges form). DIVERGENT BOUNDARY
All the continents that were once joined together in a supercontinent, meaning "all lands". PANGAEA
Two plates COME TOGETHER or COLLIDE (volcanic mountain and deep-ocean trenches form). CONVERGENT BOUNDARY
A device that scientists used to map the ocean floor. SONAR
Created by: gizmo131
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