| A | B |
|---|
| core | earth's center made up of very hot metal |
| mantle | thick layer of solid rock beneath earth's crust |
| crust | solid, rocky surface layer of the earth |
| lithosphere | earth's surface features: soil, rocks, landforms |
| atmosphere | layer of gases and water vapor above the earth |
| hydrosphere | water contained in oceans, lakes, rivers and underground |
| biosphere | plants and animals in earth's land and waters |
| continent | the seven large landmasses on earth's surface |
| relief | differences in elevation, or height, of a particular area's landforms |
| plate tectonics | theory that earth's surface is composed of plates or rock slabs in constant movement |
| continental drift theory | slow drift of tectonic plates causing continents to shift positions |
| Ring of Fire | ring of volcanic mountains surrounding the Pacific Ocean |
