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Matter can be changed physically or chemically. Identifying these changes is important to the study of weathering and erosion.
Used with permission from tes.com
In each example below, guess whether the change was physical (mechanical) or chemical.
1 |
2 |
3 |
4 |
5 |
6 |
Check your answers:
1 - chemical - Weathering of sandstone caused by salt.
2 - physical - Due to temperature changes. This kind of weathering is called Thermal Stress.
3 - chemical - A rusted fire hydrant. Rust is caused by oxidation.
4 - physical - Cracked rock due to ice wedging. Water freezes and forces the rock to break.
5 - chemical - Lichen on rock.
6 - chemical - due to acid rain.