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Reid Our Planet
2 Our Planet, Earth Key Ideas
| Term | Definition |
|---|---|
| orbit | path one object makes as it circles around another |
| axis | imaginary line running through Earth between the North and South Poles |
| solstice | point at which days are longest in one hemisphere and shortest in another |
| revolution | circular journey around the sun |
| equinox | point at which, everywhere on Earth, days and nights are nearly equal in length |
| rotation | complete turn |
| time zones | areas sharing the same time |
| core | sphere of very hot metal at the center of Earth |
| atmosphere | thick layer of gases or air |
| landform | shapes and types of land |
| crust | thin layer of rocks and minerals that surrounds Earth's mantle |
| weathering | process that breaks rocks down into tiny pieces |
| valley | stretch of low land between mountains or hills |
| erosion | process in which water, ice, or wind remove small pieces of rock |
| deposition | process of depositing material eroded and carried by water, ice, or wind |
| plateau | large, mostly flat area that rises above the surrounding land |
| plain | large area of flat or gently rolling land |
| delta | a flat plain formed on the seabed where a river deposits material over many years |
| plate tectonics | theory that explains how huge blocks of Earth's crust called "plates" move |
| magma | stream of soft, nearly molten rock |
| plate | block of rock and soil that makes up Earth's crust |
| fault | seam in Earth's crust |
Created by:
marydykstra
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