| Term | Definition |
|---|
| glacier | large mass of compacted snow and ice that moves under the force of gravity |
| snow line | the lowest elevation at which the layer of permanent snow occurs in summer |
| valley glacier | a glacier that moves within valley walls |
| continental glacier | a glacier that covers a large part of a continent |
| ice cap | a glacier that is less than 50,000 square kilometers in area |
| crevasses | great fissures or cracks |
| ice front | the end of a glacier |
| calving | the process in which great blocks break off a glacier to become icebergs |
| till | the unsorted and unstratified rock material that is deposited by a melting glacier |
| moraine | the accumulation of glacial till |
| striations | parallel scratches |
| glacial valley | the formation from a moving glacier of a U-shaped valley |
| cirque | a semicircular basin |
| outwash | materials deposited by glacial meltwater |
| erratics | large boulders that have been transported into an area bya glacier |
| drumlins | long, smooth, canoe-shaped hills |
| outwash plains | a gently sloping deposit of sediment formed beyond the terminal moraine by stremans from a melting glacier |
| eskers | winding ridges of deposits that slump down at the sides |
| kames | small, cone-shaped hills of stratifies sand and gravel |
| kettles | bowl-shaped hollows found n moraines and outwash plains |
| ice age | periods of glaciation |
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