| A | B |
|---|
| plant acid | weak acid that dissolves in certain minerals in rocks |
| sulfuric acid | the by-product of the burning coal as a source of energy |
| talus slopes | pieces of broken rock pileup in certain areas |
| stable rock | a rock composed of minerals that resist chemical weathering |
| carbonation | the process in which carbonic acid reacts chemically with other substances |
| oxidation | the process in which oxygen chemically combines with another substance |
| chemical weathering | weathering that involves changes in the chemical make-up of rocks |
| abrasion | the wearing away of a substance by solid particles carried by wind, water, and other sources |
| landslide | a large downhill movement of loose rocks and soil caused by the pull of gravity |
| root-pry | the breaking apart of rocks caused by the growth of plants |
| frost | action the breaking apart of a rock caused by the water freezing and expanding within cracks |
| exfoliation | the breaking off of curved sheets or slabs parallel to a rock's surface due to weathering |
| mechanical weathering | weathering that does not involve changes in the chemical make-up of rocks |
| weathering | the breaking down of rocks and other materials at the earth's surface |
