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Plate and movement
| Term | Definition |
|---|---|
| Crust | The layer of rock that forms Earth's outer surface. |
| Mantle | The layer of Earth beneath the crust. it is about 2,900 km (1,800 mi) thick, and makes up about 83 percent of earth's interior. see also core,and crust. |
| outer core | a layer of molten iron and nickel that surrounds the inner core of earth. |
| inner core | A dense sphere of solid iron and nickel at in center of earth. |
| latiude | The distance north or south of the equator measured in degrees. see also longitude. |
| longitude | The distance east or west of the prime meridian in Greenwich, England; measured in degrees. see also latitude. |
| Oceanic ridge | A mountain-like land form that develops when tectonic plates move apart or separate and a new ocean lithosphere forms. |
| sea-floor spreading | a geological process where tectonic plates pull apart at mid-ocean ridges, allowing magma to rise from the mantle, harden, and create new oceanic crust. |
| divergent boundary | a linear feature where two tectonic plates move apart, or diverge, allowing magma to rise from the mantle and create new crust |
| convergent boundary |
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