| Term | Definition |
|---|
| weathering | process that rock materials are broken down by physical or chemical processes |
| mechanical weathering | breakdown of rock into smaller pieces by physical means |
| frost action | the alternate freezing and thawing of soil and rock |
| ice wedging | one type of frost action |
| abrasion | grinding and wearing away of rock surfaces of rock or sand particles |
| chemical weathering | the process by which rocks break from chemical reactions |
| acid precipitation | rain, sleet, or snow containing high concentration of acids |
| dissolving a sugar cube | example of chemical weathering |
| examples of chemical weathering | water, acid precipitation, groundwater, air, living things |
| examples of mechanical weathering | wind, water, gravity by abrasion |
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