| A | B |
|---|
| Crust | the outer layer of the Earth. |
| Mantle | a layer below the crust. |
| Outler core | a layer of liquid metal. |
| Inner core | a solid ball of iron and nickel. |
| A plateau | a flat area that rises above the land around. |
| Weathering | a process that causes the breakdown of rocks by water, plants, ice, wind and chemicals. |
| Physical weathering | the breaking apart of rocks by wind, water, ice,and plants. |
| Chemical weathering | the breaking down of rocks by the action of chemicals. |
| Erosion | the carrying away of weathered material by water, wind, or glaciers. |
| Glacier | huge moving sheets of ice. |
| Delta | A new land at a river's mouth where dumped materials pile up. |
| Fossil | the preserved trace or remains of a once-living thing, usually a plant or an animal. |
