| A | B |
|---|
| weathering | wearing down or breaking apart rocks |
| expand | to take up more space |
| erosion | the moving of weathered rocks and soil by wind, water, or ice |
| glacier | a large mass of ice that moves very slowly |
| moraines | ridges formed from piles of dirt and rocks left behind by a melting glacier |
| pebbles | small pieces of rock that were once part of bigger rocks |
| waterfalls | caused when moving water erodes soft rock and leaves a lip of hard rock behind |
| canyon | formed by a river carving the area out of land over a long period of time |
