| A | B |
|---|
| weathering | the breaking down of the materials in the crust of the earth |
| expand | take up more space |
| ground water | water that sinks into the crust of the earth and collects there |
| pores | tiny openings or cracks in rocks or soil that water and air can get into |
| saturated | filled up |
| water table | the top level of saturated rock in the ground |
| runoff | water that runs over the ground |
| abrasion | the wearing away or rocks by rubbing and hitting |
| erosion | the breaking up and carrying away of materials in the earth's crust |
| glacier | a moving river of ice and snow |
| moraine | a long hill made of loose material carried and then left by a glacier |
| terminal moraine | a long hill of loose material formed at the front of a glacier |
| region | a place or area |
| desert | a very dry region |
| sand dune | a hill formed from sand |
| windward side | the side of a mountain or hill facing the wind |
| leeward side | the side of a mountain or hill away from the wind |
| crest | the top of a wave |
| trough | the bottom of a wave |
| shallow | not deep |
| breaker | tumbling water formed when a wave breaks |
| foam | bubbles formed on a liquid |
| surf | the foamy water made from breakers |
| horizontal | flat |
| folded | bent and pushed upward |
| expedition | a trip taken to learn something |
| earthquake | a sudden movement in the earth's crust |
| tremor | a slight shaking of the earth's crust |
| fault | a break in the crust of the earth |
| faulting | movement in the earth's crust so that one part of the ground slides past another part |
| seismograph | an instrument which measures movements in the earth's crust |
| vulcanism | movement of molten rock on or inside the domed mountain |
| domed mountain | a mountain formed by magma pushing up the crust to form a dome shape |
| sill | magma that flows in between the layers of rock in the earth's crust |
| dike | magma that cut across layers of rock in the earth's crust |
| fissure | a crack in the earth's crust |
| cinders | solid pieces of lava that are thrown our of a volcano |
| volcano | an opening in the earth's crust from which lava comes out |
| crater | a hole at the top of a volcano |
| volcanic cone | a mountain built up around the opening of a volcano |
| explosive volcano | a volcano that shoots up through the surface with great force |
| quiet volcano | a volcano formed when lave flows freely through the surface |
