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Science 4

Plate Tectonics

crust the outmost layer of the earth is the crust it is 5 to 100 km thick
mantle the layer of earth between the crust and the core contains most of earths mass
core the layer of the earth that extends from below the mantle to the center of the earth
lithosphere the outmost rigid layer of the earth
asthenosphere a plastic layer of the mantle on which pieces of lithosphere move made of solid rock
mesosphere extends from the bottom of the asthenosphere to the earth's core
tectonic plate a block of lithosphere that consists of the crust and the rigid outmost part of the mantle
continental drift the hypothesis that states the continents once formed a single land mass broke up, and drifted to their present locations
Pangaea existed when some of the earliest dinosaurs roamed the earth - a continent surrounded by a sea called panthalassa
Laurasuia - Gondwana two continents that Pangaea broke up into
Eurasia a continent that used to be connected to North America but separated from the other continents we know today
sea floor spreading process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies
Plate tectonics the theory that the earths lithosphere is divided into tectonic plates that move around on top of the asthenosphere
convergent when two tectonic plates collide
divergent boundary when two tectonic plates separate
transform boundary when two tectonic plates slide past each other horizontally
gps also known as the global positioning system uses radio waves to sense things happening on earth
ridge push when the oceanic lithosphere slides downhill under the force of gravity
slab pull when oceanic lithosphere sinks and pulls the rest of the tectonic plate with it
convection causes the oceanic lithosphere to move sideways and away from the mid ocean ridge
compression type of stress that occurs when an object is squeezed such as when two tectonic plates collide
tension is sress that occurs when forces act to stretch an object
folding the bending of rock layers because of stress in the earth's crust
fault is a surface along which rocks break and slide past each other
uplift the rising of regions of the earth's crust to higher elevations
subsidence the sinking of regions of the earth's crust to lower elevations
Created by: JaniceWlodyga