Inside the earth

Term Definition
Composition of the earth The earth is divided in three layers the crust the mantle and the core based on compounds that make up each layer.
The crust Is the thinnest layer of the earth and the most outer layer on earth.
Mantle The layer of rock between the earths crust and core
Core The central part of the Earth below the mantle.
Lithosphere The solid outer layer of the earth that consists of the crust and the rigid upper part of the mantle.
Asthenosphere The soft layer of the mantle on which the tectonic plates move
Mesosphere The strong lower part of the mantle between the asthenosphere and the outer core
Tectonic plates A block of lithosphere that consists of the crust and the rigid outermost part of the mantle
Continental Drift The hypothesis that states that the continents once formed a single land,broke up,and drifted to There present location
Sea-floor spreading The process by which new Oceanic lithosphere forms as magma rises towards the surface and solidifies
Plate tectonics
The theory that explains how large earths most outer layer,called tectonic plates,move and change shape.
Convergent boundary The boundary formed by the collision of two lithosphere plates.
Divergent boundary The boundary between two tectonic that are moving away from each other.
Transform boundary The boundary between the tectonic plates that are sliding past each other horizontally.
Compression Stress that occurs when forces act to squeeze an object
Tension Stress that occurs when forces act to stretch an object
Folding The bending of rock layer due to stress
Fault A break in a body of rock along which one block relative to another
Uplift The rising of regions of the earths crust to higher elevations
Subsidence The sinking of regions earths crust to lower elevations

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