| Term | Definition |
| glacier | a large mass of snow and ice that moves over land |
| terminus | rock debris collects at a glaciers ______, or outer margin |
| moraine | rock debris deposited by glaciers form features called |
| glacial till | moranes are made up of _____, an unsorted mix of rock materials |
| drumlin | an oval mound of till |
| erratics | isolated boulders left behind by glaciers |
| outwash plains | gravel, sand and clay carried from glaciers by melting water and streams, and deposited over large areas |
| ice ages | periods of very cold temperatures and many glaciers |
| interglacial periods | periods of warmer weather between the ice ages |