Question

which process is responsible for changing the composition of rock?
○ erosion
○ abrasion
○ chemical weathering
○ mechanical weathering

Explanation:

To determine the process changing rock composition, analyze each option:

• Erosion: Transports rock, doesn’t change composition.
• Abrasion: Mechanical scraping (physical change, no composition shift).
• Chemical weathering: Involves chemical reactions (e.g., oxidation, hydrolysis) that alter mineral composition.
• Mechanical weathering: Breaks rock into smaller pieces (physical, no composition change).

Only chemical weathering modifies rock’s chemical makeup.

Answer:

C. chemical weathering