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Earth's Structure
layers of the earth vocabulary
| Term | Definition |
|---|---|
| lithosphere | made up of the crust and the upper part of the mantle |
| crust | the thin and solid outermost layer of the Earth |
| mantle | the layer of semi-molten rock between the Earth's crust and core |
| molten | melted by heat |
| continental crust | the part of the crust that is about 25km to 70km thick that makes up the continents - thicker than oceanic but less dense -made up of mostly sedimentary and metamorphic rock |
| oceanic crust | the part of the crust that is about 6km to 11km thick that forms the ocean floors - thinner than continental but more dense - made up of mostly igneous rock |
| outer core | the liquid layer of the Earth's core made of the metals iron and nickel |
| inner core | densest and hottest layer of the Earth made of solid iron and nickel |
| mesosphere | The strong, lower part of the mantle between the asthenosphere and the outer core . (meso means middle...think word within a word) |
| asthenosphere | The soft layer of the mantle on which the tectonic plates move due to convection. |
| convection currents | heat driven cycles that occur in the air, ocean, and mantle; caused by hotter material rising and cooler material sinking |
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