Term Definition
Continental Drift The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations
Pangaea Supercontinent
Sea Floor Spreading Is the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies
Plate Tectonics The theory that explains how large pieces of the Eartha??s outermost layer, called tectonic plates, move and change shape
Convergent Boundary When tectonic plates collide
Divergent Boundary When tectonic plates separate
Transform Boundary When tectonic plates slide past each other horizontally
Convection Currents
Wegener Was a scientist in the early 1900a??s, who wrote the hypothesis on continental drift
Volcano Areas of Eartha??s surface through which magma and volcanic gases pass
Hot Spots Volcanically active places on the Eartha??s surface that are far from plate boundaries
Mid – Ocean Ridges Places where sea – floor spreading takes place
Subduction
Vent Cracks in the Eartha??s crust that allows magma to rise from the magma chamber and slip through the cracks
When hot rocks inside the Earth heat up and rise to the crust then cools and sinks back down over and over again
Old ocean crust gets pushed into the asthenosphere, where it is remelted and recycled
Plate Tectonics

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