| Term | Definition |
|---|
| Crust | the thin and solid outer most layer of the earth above the mantle |
| Mantle | The layer of rock between the earths crust and core |
| Inner Core | it is solid, dense and extends from bottom of outer core to center of the earth |
| Mesosphere | Its the strong lower part of the manlt, between asthenosphere and the outor core extends from asthenosphere to earths core |
| Fault | A break in a body of a rock along which one block slides relative to another |
| Divergent | PLates move away from eachother |
| Convergent | plates move toward eachother |
| continental drift | hypothesis that stats that continents once formed a single landmass broke up and driffed to the preasant locations |
| sea floor spreading | the proces by which new oceanic lithosphere forms as magma rises towards the surface and solidifies |
| Transform slip | the boundry between tectonics plates that are sliding past eachother horizontally |
| pangaea | present continents were joined in a single huge continent "all the earth" |
| convergent | when plates move towards eachother |
| seismograph | an instrument that records vibrations in the ground and determines the location and strength of earthquakes |
| magnetic reversal | the earth magnetic plates change places |
| mid ocean ridge | an underwater mountain that takes place where sea floor spreading takes place |
| seismic waves | a wave of energy that travels through the earth and away from earthquakes in all directions |
| plate tectonics | it explains that the earth is divided into pieces in the lithosphere that move around on top of the asthenosphere |
| ocean crust | the thinnest part of the plate |
| compound | a substance composed of two or more elements |
| continental crust | the thickest part of a tectonic plate |
| asthenosphere | the soft layer of the mantle on which the tectonic plates move |
| lithosphere | the solid outer layer of the earth that consists of the crust and the rigid upper part of the mantle |
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