| A | B |
|---|
| u-shaped | when a valley is shaped like a u |
| weathering | the process by which rocks are chemically altered or pysically broken down |
| water | water?? |
| hydraulic action | occurs when waves pound on cracks in rocks |
| permeable | water can easily pass through it |
| erosion | the process that wears down and carries away rock and soil |
| salt | contained in ocean water which comprises most of the water on earth |
| law of superposition | if rock layers are undisturbed,younger rocks lie above older rocks, and the oldest rocks are at the bottom |
| impermeable | water cannot easily pass through it |
| saltation | the process of particles bouncing along a stream bottom |
| continental shelf | the gently sloping plain which forms an apron of shallow water along the edges of most continents |
| oceanic | of or relating to the ocean |
| dilution | The process of making weaker or less concentrated |
| glaciers | a large mass of moving ice and snow on land |
| continental glacier | a thick sheet of ice that covers a huge area such as a continent or island |
| oxidation | type of chemical weathering that causes the rusting of minerals that are rich in iron |
| water table | the top of the saturated zone |
| aquifer | a permeable rock layer that is saturated with water |
| mechanical weathering | the process of physically breaking rock into smaller fragments |
| salinity | the proportion of dissolved salts in water |
| carbon dioxide | naturally combines with water to form carbonic acid which, in rainwater, results in a chemical weathering which dissolves many minerals |
