| A | B |
|---|
| uniformitarianism | the geologic principle that the same geologic processes that operate today operated in the past to change Earth's surface |
| erosion | process of wearing down and carrying away rocks |
| weathering | process that breaks down rock and other substances |
| mechanical weathering | weathering in which rock is physically broken into smaller pieces |
| chemical weathering | process that breaks down rock through chemical changes |
| adrasion | wearing away of rock by rock particles carried by water, ice, wind, or gravity |
| frost wedging | process that splits rock when water seeps into cracks, then freezes and expands |
| oxidation | a chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust |
| permeable | characteristic of a material that contains connected air spaces, or pores, that water can seep through easily |
