Which term describes the breaking down of rocks by mechanical forces such as temperature changes or water freezing?

Which term describes the breaking down of rocks by mechanical forces such as temperature changes or water freezing?

• A. Mechanical Weathering
• B. Chemical Weathering
• C. Biological Weathering
• D. Erosion

Answer: (A)

The main idea is breaking rocks into smaller pieces using physical forces rather than chemical changes. Temperature changes cause rocks to expand and contract, creating stress and cracks, while water that freezes in those cracks pushes the rock apart through frost wedging. This breaks rock without changing its mineral composition, which is the essence of mechanical weathering. If minerals were dissolved or chemically altered, that would be chemical weathering. Erosion describes the movement of weathered material away, not the initial breakup, and biological weathering involves organisms contributing to breakdown. So, this is mechanical weathering.

The main idea is breaking rocks into smaller pieces using physical forces rather than chemical changes. Temperature changes cause rocks to expand and contract, creating stress and cracks, while water that freezes in those cracks pushes the rock apart through frost wedging. This breaks rock without changing its mineral composition, which is the essence of mechanical weathering. If minerals were dissolved or chemically altered, that would be chemical weathering. Erosion describes the movement of weathered material away, not the initial breakup, and biological weathering involves organisms contributing to breakdown. So, this is mechanical weathering.