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vocacb
| vocab | definition |
|---|---|
| crust | the layer of rock that forms Earth's outer surface |
| mantle | the layer of hot,solid material between earths crust and core |
| 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 the center of earth |
| latiitude | the distance north or south of the equator measured in degrees |
| longitude | the distance east or west of the prime meridian in Greenwich,englend measured in degrees. |
| ocean ridge | a mountain like landform that develops when tectonic plates move apart or separate and a new ocean lithosphere forms. |
| sea floor spreading | a process by witch new seafloor is formed from the magma rising from earths diverging oceanic plates. |
| divergent boundry | location were two tectonic plates meet and are moving away from each other. |
| convergent boundary | location where two tectonic plates meet and are moving toward each other |
| transform boundry | location where two tectonic plates meet and slide past each other |
| subduction | the process by witch one plate of the lithosphere sinks and slides under another |
| ocean trench | long deep formation on the ocean floor that develops where two tectonic plates are moving toward each other and one is moving under the other |
| tectonic plate | a peice of earth crust that according to plate tectonics is pushed by movement in the asthenosphere |
| lithosphere | the cool solid outer shell of earth it consists of the crust and the rigid uppermost part of mantle and is broken up into segments or plates. |
| fracture | the breakage of a rock into two or more peices |
| elasticity | the ability of rock to be stretched and then return to its original position once the stress has been removed |
| stress | the amount of force being applied to a rock or surface |
| strain | change in volume, size, or shape that results from stress |
| plate boundary | a place where peices of the of the broken lithosphere meet boundary types include convergent, divergent and transform |
| continental crust | crust that contains mostly land ranging from 15 to 70 kilometers,(9 to 43 miles) thick |
| oceanic crust | crust that lies beneath the ocean ranging from 5 to 10 km thick |
| friction | a force that opposes the motion of objects witch are in contact |
| rift valley | dcyufrxythe valley formed by a diverging plate boundry |
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