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plate movement
| Question | Answer |
|---|---|
| crust | earth's outer layer; the coolest and least dense layer of earth. see also core, and mantle. |
| 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 earth |
| inner core | a dense sphere of solid iron and nickel at the center of earth |
| latitude | the distance north 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 landform that develops when tectonic plates move apart or separate and a new ocean lithosphere form |
| sea-floor spreading | the process by which molten material adds new oceanic crust to the ocean floor |
| divergent boundary | a plate boundary where two plates move away from each other. |
| convergent boundary | a plate boundary where two plates move toward each other |
| transform boundary | a plate boundary where two plates move past each other in opposite directions. |
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