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Plate Tectonics

Vocabulary

TermDefinition
Pangea all the continents were once part of a supercontinent.
Continental drift suggested that continents are in constant motion on the surface of Earth.
Mid-ocean ridges the mountain ranges in the middle of the oceans.
Seafloor spreading the process by which new oceanic crust forms along a mid-ocean ridges 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 the magnetic field reverses direction.
Reversed polarity a state in which magnetized objects would reverse direction and orient themselves to point south.
Plate tectonics Earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other.
Lithosphere the cold and rigid outermost rock layer.
Divergent plate boundary forms where two plates separate.
Transform plate boundary forms where two plates slide past each other.
Convergent plate boundaries forms 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 ridges creates the potential for plates to move away from the ridge.
Slab pull a slab sinks, it pulls on the rest of the plate.
Created by: J. Rivera
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