| A | B |
|---|
| Abrasion | Rock particles wear away rock. |
| Freezing & Thawing | Breaks rock by ice wedging. |
| Animal Actions | Ground breaks away by animals burrowing. |
| Plant Growth | Roots grow into cracks of rocks & pry them apart. |
| Acid Rain | Results from burning fossil fuels causing minerals to wear away rapidly. |
| Carbonic Acid | Forms from CO2 dissolving in water then weathers marble & limestone. |
| Living Organisms | Plants produce weak acid that slowly dissolve rocks that surround roots. |
| Oxygen | Oxidation produces rust on some rocks that have iron |
| Weathering | process that breaks down rocks & other substances on Earth's surface |
| Mechanical | Weathering that occurs as rock is physically broken down into smaller pieces |
| Chemical | Weathering that occurs as rock is broken down through chemical changes |
