| A | B |
|---|
| weathering | the process that breaks down rock and other substances at Earth's surface |
| erosion | the removal of rock particles by wind, water, ice, etc. |
| uniformitarianism | a principle that states that the same processes that operate today operated in the past |
| mechanical weathering | a type of weathering where rock is physically broken into smaller pieces |
| abrasion | refers to the grinding away of rock by rock particles carried by water, ice, wind or gravity |
| ice wedging | when wedges of ice in rocks widen and deepen cracks |
| chemical weathering | a type of weathering process that breaks down rock through chemical changes |
| oxidation | when iron combines with oxygen in the presence of water |
| permeable | means a material is full of tiny, connected air spaces that allow water to seep through it |
