| Term | Definition |
|---|
| imprint | mark made by pressing |
| mold | a hollow form with a particular shape |
| cast | something that is formed or shaped in a mold |
| petrified | turned to stone |
| amber | hardened sap |
| glacier | large mass of ice and snow that moves over land |
| terminus | the end or outer margin of a glacier |
| moraines | made up of glacial till |
| glacial till | unsorted mixture of rock materials deposited as a glacier melts |
| humus | leftover plant and animal matter |
| topsoil | top layer of soil |
| subsoil | fairly hard layer made of clay particles and minerals |
| soil profile | vertical section of soil from the surface down to bedrock |
| pore spaces | spaces between soil particles filled with water and air |
| permeability | rate at which water can pass through porous material |
| erosion | when wind, running water, waves, and gravity change the earth's shape |
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