| A | B |
|---|
| sedimentary rock | Rock that forms when sediment or the remains of plants and animals are cemented together. |
| igneous rock | Rock that forms when molten rock cools and hardens |
| metamorphic rock | Rock that forms when other rocks change because of chenical reactions, heat, or pressure |
| glacier | A long-lasting mass of moving ice and snow. They advance and retreat with immense weight |
| evaporates | The process of a liquid changing into a gas |
| crystals | A solid material with a pattern that repeats over and over |
| compressed | Made smaller by squeezing |
| advance | a glacier moves forward |
| retreat | To move backward |
| glacial polish | The smooth, shiny appearance of rock caused by movement of a glacier |
| glacial striations | Long scratches in rock caused by movement of a glacier |
| moraines | Hill-like piles of unsorted rocks and sediment dropped by a glacier |
| kettle | A small, scooped-out area left by the melted ice of a glacier. |
| cirque | A deep bowl shaped depression that a glacier carved |
| alpine lake | A lake forms as a result of glacial meltwater or snowmelt filling a cirque |
| horns | A peak with many steep sides carved by small glaciers |
| erratics | A large rock moved and dropped by a glacier far from where it originated |
| continental glaciers | Sheets of glacial ice that cover a large expanse of land, such as Greenland |
