Concept:Thermal weathering is the physical breakdown of rocks caused by repeated temperature changes.
Explanation:Rocks expand when heated and contract when cooled.
The alternate heating and cooling create repeated stress inside the rock.
Over time, this stress weakens the rock and causes it to crack.
Eventually, the rock breaks apart into smaller pieces.
This process of breaking apart is called fragmentation.
It is a form of physical, or mechanical, weathering and does not change the rock's chemical composition.
Answer:The alternative heating and cooling of rocks results in fragmentation. The correct option is C. fragmentation.