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Layers of the Earth
| Term | Definition |
|---|---|
| crust | Earth's thin outer layer, composed of sand, and rock, least dense material |
| mantle | thick liquid made of rock, magma, just under earth’s crust, where convection currents rise and fall moves earth’s plates |
| 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 that is as hot as the surface of the sun. |
| tectonic plate | Sections of the Earth's crust that move due to convection currents. |
| continental plates | Tectonic plates including land |
| oceanic plates | plates that form the floor of the ocean |
| subduction | Process in which one plate moves under another plate, and into the mantle, takes place at a convergent boundary. |
| mountains | Formed by two continental plates colliding and forcing each other upwards. |
| earthquakes | A sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action |
| primary waves | A longitudinal body wave; travels through solids, liquids, and gases and is the fastest seismic wave, first recorded during an earthquake |
| secondary waves | waves that travel outward from an earthquake's focus and move through Earth by causing particles in rocks to vibrate at right angles to the direction of the wave |
| surface wave | travels across the surface of the Earth as opposed to through it, slowest moving seismic wave, but caused the most danger. |
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casmith19
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