Answer:
1. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. If temperatures drop low enough, the water will freeze. Changes in temperature cause rock to expand (with heat) and contract (with cold).
2. Forces like wind and water break down rocks through the processes of weathering and erosion. Weathering is the process that breaks down rocks. Many things cause weathering, including climate changes. Weathering and erosion help shape Earth's surface.
3. Burrowing animals can move rock fragments to the surface, exposing the rock to more intense chemical, physical, and biological processes and so indirectly enhancing the process of rock weathering.
4. Mining increases rates of both weathering and erosion. Because digging and blasting break rock into smaller pieces (mechanical weathering), waste rock has more surface area exposed to chemical weathering.
5. Plants can cause mechanical and chemical weathering. When plants cause mechanical weathering, their roots grow into rocks and crack them.It can also happen in streets or sidewalks. When plants cause chemical weathering, there roots release acid or other chemicals, onto rocks, which then forms cracks, and breaks apart.
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