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10 terms

Plate Tectonics: A scientific theory unfolds

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continental drift
the gradual movement and formation of continents (as described by plate tectonics)
plate tectonics
the theory that the Earth's lithosphere is divided into tectonic plates that move around on top of the asthenosphere
divergent boundaries
places where two plates pull apart
convergent boundaries
when two tectonic plates push into one another
transform boundaries
a place where two plates slip past each other moving in opposite directions
subduction
THe process of thrusting oceanic lithosphere into the mantle along a convergent boundary
hot spot
a concentration of heat in the mantle capable of producing magma, which rises to Earth's surface; The Pacific Plate moves over a hot spot, producing the Hawaiian Islands
mantle plume
A buoyant mass of hot rock rising through Earth's mantle. As it nears the surface of Earth, some of the plume melts and erupts at the surface forming a "hot spot."
curie point
The temperature above which a material loses its magnetization.
volcanic island arc
a chain of volcanic islands generally located a few hundred kilometers from a trench where there is active subduction of one oceanic plate beneath another