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Chapter Seven

Plate Tectonics

TermDefinition
Pangaea Alfred Wegenger proposed that all the continents were once part of a super continent.
Continental drift Continents are in constant motion on the surface of the earth.
Mid ocean ridges The mountain ranges in the middle of the ocean
Seafloor spreading New oceanic crusts forms along a mid ocean range and older oceanic crusts moves away from the ridge
Normal polarity magnetized objects such as compass needles, will orient themselves to point north.
magnetic reversal magnetized field reverses direction
reversed polarity magnetized objects would reverse direction and orient themselves to point south.
Plate tectonics Earths surface is made up 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 boundary where two plates collide.
subduction the denser the plate sinks the more buoyant plate in a processs
convection The circulation of material caused by difference in temperature and density.
ridge push Rising mantle material at mid ocean ridges creates the potential for plates to move away from the ridge with a force
slab pull as a slab sinks, it pulls the rest of the plate with a force.
Created by: InaayaQ
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