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section 1 science
Term | Definition |
---|---|
crust | the thin and solid outer crust layer of the earth above the mantle. |
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 consist 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 astenosphere and the outer core. |
tectonic plate | a block of lithosphere that consist of the crust and the rigid outer most part of the mantle. |
continental drift | the hypothesis that states that the contienents oce formed a single landmass broke up,and drifted to their present location |
sea-floor spreading | the process by which new oceanic lithosphere forms as magma rises and solidifies. |
plate tectonics | the theory that explains how large pieces of the earths outer most layer. |
covergent boundary | the boundary formed by collision of two lithosphere plates |
divergent boundary | the boundary between two tectonic plates that are moving away from each other |
transform boundary | the boundary between 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 layers due to stress |
fault | a break in a body of rock along which one block slides relative to another |
uplift | the rising of regions of the earths crust to higher elavations |
subsidence | the sinking of the regions of the earths crust to lower elavations |