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Earth's layers

4 layers and crust components

crust the thin, outer layer of Earth is called its crust
mantle a very thick layer of Earth found under the crust
inner core the center of the Earth which is very hot and solid. It is 1,250 km thick.
outer core the layer of theEarth made of very hot liquid iron and nickel. It is 2,200 km thick.
lithosphere consists of the crust and the upper part of the mantle
asthenosphere the lower part of the Earth's mantle and consists of partially molten rock
tectonic plates approximately 12 plates that make up the surface of the Earth and are always moving
convection currents hot mantle material rises to the top, cools & drops down again creating a continuous circular motion
seismic waves shock waves in solid rock generated by earthquakes or underground explosions
continental crust the part of the crust that includes continents
oceanic crust the crust that includes the ocean floors
convergent boundary a tectonic (plate) boundary where two plates are moving toward each other.
divergent boundary a tectonic (plate) boundary where two plates are moving away from each other
transform boundary a tectonic boundary when two plates grind past each other as they move in opposite directions
sea floor spreading the process n which liquid rock rises and becomes solid as two tectonic plates move farther apart
med ocean ridge a series of mountain ranges on the ocean floor
Pangea a "super continent" that existed 200 million years ago that broke apart and moved to form the seven continents that exist today.
subduction one edge of a plate is forced below another
continental drift the movement and re-formation of continents resulting from the movement of plates
Created by: judyamac