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Chapter 7

Plate Tectonics

QuestionAnswer
All the continents were once part of a supercontinent Pangea
Suggests that continents are in constant motion on the surface of Earth Continental drift
The mountain ranges in the middle of the ocean Mid-ocean ridges
The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge Seafloor spreading
A state in which magnetized objects, such as compass needles, will orient themselves to point north Normal polarity
The magnetic field reverses direction Magnetic reversal
A state in which magnetic magnetized objects would reverse direction orient themselves to point south Reversed polarity
States that Earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other Plates tectonics
The cold and rigid outermost rock Lithosphere
Forms where two plate separate Divergent plate boundary
Forms where plates slide past each other Transform plate boundary
Forms where two plates collide Avergent plate boundaries
The denser plate sinks below the more buoyant plate in a process Subduction
The circulation of material caused by differences in temperature and density Convection
Rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with a force... Ridge push moves lithosphere in opposite directions away from the mid-ocean ridge Ridge push
When a slab sinks, it pulls on the rest of the plate with a force Slab pull
Created by: Laila Monroe
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