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Plate Tectonics

Vocabulary dealing with plate tectonics

The name of the single landmass that broke apart 225 million years ago and gave rise to today’s continents. Pangaea
The theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle. Plate Tectonics
The process by which molten material adds new oceanic crust to the ocean floor. Sea Floor Spreading
A plate boundary where two plates move toward each other. Convergent Boundary
The hypothesis that the continents were once together and have slowly moveed across Earth’s surface. Continental Drift
A plate boundary where two plates move away from each other. Divergent Boundary
The undersea mountain chain where new ocean floor is produced; a divergent plate boundary. Mid Ocean Ridge
The movement of a fluid, caused by differences in temperature and density that help move the plates across the Earth. Convection Current
A system that determines the distance of an object under water by recording echoes of sound waves. Sonar
A plate boundary where two plates move past each other in opposite directions. Transform Boundary
This person came up with the Theory of Continental Drift. Alfred Wegener
This person came up with the idea of Sea Floor Spreading. Harry Hess
The process were old oceanic crust sinks back into the asthenosphere and melts. Subduction
Why was Wegener's theory widely rejected by scientists? No proof of HOW the continents moved.
The east coast of South America appears to fit like a "puzzle piece" with what other continent? Africa
What do you call the broken pieces of the lithosphere? Tectonic Plates
This type of crust is mostly made of basalt and is more dense. Oceanic Crust
This type of crust is mostly made of granite and is less dense. Continental Crust
What forms when a divergent boundary occurs on land (between 2 continental crusts)? Rift Valley
When 2 continental crust collide at a convergent boundary, what will form? Mountains
Created by: MRGDMS
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