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Layers of the Earth
| Term | Definition |
|---|---|
| inner core | ball of hot, solid metal at Earth's center; very high pressure causes it to be solid |
| outer core | layer of liquid metal surrounding the inner core; less pressure and lower temperature than inner core |
| mantle | thickest layer of Earth made up of hot rock; less dense than core |
| crust | thin layer of cool rock that surrounds Earth like an eggshell; 2 types |
| continental crust | includes all continents; less dense & mostly composed of granite |
| oceanic crust | includes all the ocean floors; more dense & mostly composed of basalt |
| lithosphere | made up of the crust and the cool, rigid part of the upper mantle. It is broken into tectonic plates and sits on top of the asthenosphere |
| asthenosphere | layer of hotter, softer rock in Earth's upper mantle; flows like tar |
| relative position | the location of something in comparison to its surroundings |
| composition | the makeup of a substance; example: carbon dioxide is made up of one carbon atom and two oxygen atoms |
| density | the amount of "stuff" present(mass) in a certain amount of space (volume); Density = Mass/Volume |
| convection currents | hot, soft rock in the asthenosphere and the lower mantle move by convection; hotter less dense rock rises & cooler, denser rock sinks back down, only to be heated and rise again |
Created by:
lcochrane
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