Inside the earth

Term Definition
Crust The outermost layer of the earth
Mantle The layer of earth between the crust and the core
Core The central part of earth below the mantle
Lithosphere The outermost rigid layer of the earth
Asthenosphere A plastic layer of the mantle on which pieces of lithosphere move
Mesosphere The extension of from the bottom of the asthenosphere to the earths core
Tectonic plate Pieces of the lithosphere that move around on top of the asthenosphere
Continental drift The hypothesis that states that the continents once formed a single landmass broken up
Sea floor spreading The process of which new oceanic lithosphere forms magma rises toward the surface and solidifies
Plate tectonics The theory that the earths lithosphere is divided into tectonic plates
Convergent boundary When two tectonic plates collide the boundary between them is convergent boundary
Divergent boundary When two tectonic plates separate the boundary between them is called divergent boundary
Transform boundary When two tectonic plates slide past each other horizontally the boundary between them is transform boundary
Compression The type of stress that occurs when an object is squeezed such as when two tectonic plates collide
Tension The stress that occurs when forces act to stretch an object
Folding The bending of rock layers because of stress in the earths crust is called folding
The surface along which rocks break and slide past each other is called a fault
Uplift The rising of regions of earths crust to higher elevation
Subsidence The sinking of regions of earths crust to lower elevations

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