| A | B |
|---|
| runoff | water that runs over the ground |
| abrasion | the wearing away of rocks by rubbing and hitting |
| erosion | the breaking up and carrying away of materials in the earth's crust |
| source | a river's head or place where the river starts |
| bed | the bottom of the river |
| banks | the sides of a river |
| mouth | the place where a river ends |
| meander | flow in a wavy path |
| deposition | the settling of rock material where the water in a river is slowing down |
| delta | a mud deposit found at the mouths of some rivers |
| tributaries | smaller rivers that flow into a larger river |
| sediment | soil and other matter that has settled to the bottom of the river |
| flood plain | an area alongside a river where soil is deposited during flooding |
| meanders | curved loops in a river |
| distributaries | smaller rivers that flow out of another river |
| glaciers | 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 |
| erratics | a rock carried a large distance by a glacier |
| continental glacier | a sheet of ice large enough to cover a part of a continent |
| Antarctica | region surrounding the south pole now covered by a continental 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 |
| shoreline features | the different shapes of a shoreline produced by wave action |
| sea cliffs | steep-faced rocks on the a shoreline |
| wave- cut | a flat section of rock remaining when the rock above was worn away by wave action |
| promontory | a section of hard rock that sticks out into the ocean |
| sea arch | arch formed when waves cut through a promontory |
| stack | tiny rock island formed when the top of a sea arch falls into the sea |
| undertow | backward flow of water |
| beach | shoreline covered by weathered rock material |
| longshore current | flow of water parallel to the shoreline |
| sandbar | a long underwater deposit of sand parallel to the shoreline |
| offshore bar | deposit of sand sticking out of the water and running parallel to the shoreline |
| lagoon | water between an offshore bar and the mainland |
| gully | a deep grove in the ground |
