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plate tectonics

Vocab ch 7

TermDefinition
Pangea name given to a super continent that began to approximately 200 years ago.
continental drift the movements of earths continents over time.
mid- ocean ridges are much longer than any mountain range on land.
seafloor spreading is the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
normal polarity a state in which magnetized objects, such as compass needles, will orient themselves to point north.
magnetic reversal occurs and the magnetic field reverses direction.
reversed polarity a state in which magnetized objects would reverse direction and orient themselves south.
plate tectonics states that earth's surface is made up of rigid slabs of rock, or plates, that move with respect towards each other.
lithosphere the cold and rigid outermost layer .
transform plate boundary forms where two plates slide past each other.
convergent plates boundaries form where two plates collide .
subduction the denser plate sinks below the more buoyant plate .
convection the circulation of material caused by differences in temperature and density.
ridge push rising mantle material at mid-ocean creates the potential for plates to move away with a force.
slab pull as a slab sinks, it pulls on the rest of a plate.
divergent forms where two plates separate, when the seafloor spreads at mid ocean ridge, lava erupts, and cools.
Created by: alexia0216
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