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Chapter 7 vocab

TermDefinition
Pangaea over time Pangaea began breaking apart, and the continents slowly moved to their present positions.
continental drift which 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 is the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away form the ridge.
normal polarity a state in which 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 to point south.
plate tectonics states that Earth's surface is made of rigid slabs of rock, or plates
lithosphere the cold and rigid outermost rock layer
divergent plate boundary forms where to plates separate
transform plate boundary forms where two plates slide past each other
convergent plate boundaries form where two plates collide
subduction the denser plate sinks below the more buoyant plate in process
convection the circulation of material caused by differences in temperature and density
ridge push ridge push moves thee lithosphere in opposite directions away from the mid-ocean ridge
slab pull as a slab sinks, it pulls on the rest of the plate with a force
Created by: Is-rael
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