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7th Grade Ch 9

Plate Tectonics

TermDefinition
Pangaea name given to a supercontinent that began to break apart approximately 290 million hears ago
continental drift the movement of Earth's continents over time
mid-ocean ridge long, narrow mountain range on the ocean floor; formed by magma at divergent plate boundaries
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 when magnetized objects orient themselves to point north
magnetic reversal an event that causes a magnetic field to reverse direction
reversed polarity when magnetized objects reverse direction and orient themselves to point south
plate tectonics theory that Earth's surface is broken into large, rigid pieces that move with respect to each other
lithosphere the rigid, outermost layer of Earth that includes the uppermost mantle and crust
divergent plate boundary the boundary between two plates that move away from each other
transform plate boundary the boundary between two plates that slide past each other
convergent plate boundary the boundary between two plates that move toward each other
subduction the process that occurs when one tectonic plate moves under another tectonic plate
convection the circulation of particles within a material caused by differences in thermal energy and density
ridge push the process that results when magma rises at a mid-ocean ridge and pushes oceanic plates in two different directions away from the ridge
slab pull the process that results when a dense oceanic plate sinks beneath a more buoyant plate along a subduction zone, pulling the rest of the plate that trails behind it
Created by: lrlong7
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