| A | B |
|---|
| plate | A large section of the earth's surface made of the crust and the rigid part of the mantle. |
| weathering | The process that breaks down and changes rocks. |
| erosion | The moving of weathered rocks and soil. |
| igneous rock | Rock formed from melted rock that comes from deep within the earth. |
| deposition | The dropping of materials moved by erosion. |
| metamorphic rock | Rock formed when igneous or sedimentary rock is changed by heat or pressure. |
| sedimentary rock | Rock formed when sediments are pressed or cemented together. |
| rock cycle | The ways that rocks change from one form to another. |
| mantle | The middle layer of the earth, between the crust and the core. |
| core | The center part of the earth, beneath the mantle. |
| mineral | Material that forms in the earth from nonliving matter. |
| hydrosphere | The water part of the earth's surface. |
| lithosphere | The rigid outer shell of the earth. |
| crust | The top layer of the earth, above the mantle. |
| plate tectonics | The theory stating that the earth's surface is broken into plates that move. |
| atmosphere | The layer of gases that surrounds the earth and contains the clouds. |
| Mohs Hardness Scale | A scale for measuring the hardness of minerals. |
| lava | Hot moletn material that comes out of a volcano. |
| magma | The molten material beneath or within the earth's crust, from which igneous rock is formed. s |
| Pangaea | The hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago. |
