Glaciation

5. Sharp mountain summit where three or more arêtes meet.
7. Scratches or grooves left in rocks by the movement of glaciers.
8. When a glacier lifts and removes pieces of rock from the ground as it moves.
10. Smooth, oval-shaped hill made of glacial deposits that shows the direction of ice movement.
12. The scraping and grinding of rocks on the land by debris carried in a glacier.
13. Series of small, stepped lakes in a glacial valley.
14. A huge, thick layer of ice covering large areas of land, like Antarctica or Greenland.
17. Unsorted mixture of clay, sand, and rocks deposited directly by glaciers.
18. Narrow, knife-edge ridge formed between two glacial valleys.

1. Steep cliff left where a glacier has cut through a ridge of land.
2. Long, narrow lake formed in a glacial valley.
3. Smaller valley left above the main glacial valley, often with a waterfall.
4. A large, slow-moving body of ice formed from compacted snow.
6. Small lake formed in a hollow left by a glacier in a mountain.
9. Wide, flat-bottomed valley with steep sides created by glacial erosion.
11. A long period when large parts of the Earth are covered with ice sheets and glaciers.
15. Bowl-shaped hollow found high on a mountain, carved by a glacier.
16. Large rock carried and left behind by glaciers, different from the local bedrock.