| A | B |
|---|
| crust | the outer layer of the Earth |
| mantle | the middle layer of the Earth |
| core | the center part of the Earth made mostly of iron |
| to weather | to wear down or break apart rocks |
| weathering | caused by freezing water, plant roots, rainwater, and gases in the air |
| carbon dioxide | mixes with water to cause weathering |
| erosion | the movement of soil or rocks by wind or water |
| earthquake | a shaking or sliding of the Earth's crust |
| volcano | a mountain with an opening at the top |
| magma | hot, melted rock deep inside the Earth |
| lava | hot, melted rock that flows from a volcano |
