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Chapter 7

Plate Tectonics

TermDefinition
Pangaea all the continents were one part of a supercontinent.
continental drift which suggested that continents are in constant motion on the surface of Earth.
Mid-ocean ridge 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 from the ridge.
Normal polarity a state in which magnetized objects, such as compass needle will orient themselves to point north.
Magnecti reversal occurs and the magnetic field reverse direction.
Reserved polarity a state in which magnetized objects would reverse direction and orient themselves to point south, as show in.
Plate Tectonics state that Earth's surface is made of rigid slabs, or plates, that move with respect to each other.
Lithophere the cold and rigid outer most rock layer.
Divergent plate boundary forms where two plates separate.
Transform plate boundary forms where two plates slide past each other.
Convergent plate boundary from where two plates collide.
Subduction the denser plate sinks below the more buoyant plate in a process.
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 always from the ridge with a force.
Slab pull a slab sinks it pulls on the rest of the plate with a force.
Created by: ajayieli
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