Concept:In deserts, high temperature and wind are the main agents that cause rock weathering.
Explanation:High temperature makes rocks heat up and cool down rapidly.
This repeated expansion and contraction causes cracks and flaking on rock surfaces.
Wind carries sand and dust particles that constantly strike the rocks.
These particles scrape and wear away the rock surface over time.
In deserts, water is scarce and vegetation is limited.
Therefore, animal activity and root growth play only a minor role.
Answer:C. wind