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Chapter 7 - Vocab

Chapter 7 - Vocab - Plate techtonics

TermDefinition
Pangaea A super continent that today's continents were once a part of.
Continental drift A hypothesis which suggests that continents are in constant motion on the surface of the 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 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 An event when the magnetic field reverses direction.
Reversed polarity A state in which, magnetized objects would reverse direction, orient themselves to point south.
Plate tectonics Rigid slabs of rock, or plates, that move with respect to each other that make up the Earth's surface
Lithosphere The cold and rigid outermost rock layer.
Divergent plate boundary An area which forms where two plates separate.
Transform plate boundary An area which forms where two plates slide past each other.
Convergent plate boundaries An area which forms where two plates collide
Subduction The process which a denser plate sinks below a more buoyant plate.
Convection The circulation of material caused by differences in temperature and density.
Ridge push The force that moves lithosphere in opposite directions away from the mid-ocean ridge.
Slab pull The force that pulls on the rest of the plate as a slab sinks.
Created by: hozlomic1
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