What is the difference between weathering and erosion?

• A. Weathering and erosion are the same
• B. Weathering occurs only in water
• C. Erosion breaks material down; weathering moves it
• D. Weathering breaks material down; erosion moves it

Answer: (D)

Weathering is the in-place breakdown of rocks and minerals into smaller pieces or altered materials, caused by mechanical actions like freeze-thaw, root growth, and abrasion, and by chemical processes such as dissolution and oxidation. Erosion is the movement of those weathered materials away from their original location by forces like water, wind, ice, or gravity. The difference is that weathering happens where the material sits, breaking it down, while erosion transports the fragments elsewhere. Weathering prepares material for transport, and erosion relocates it. The other statements misstate the roles or limit weathering to water, which isn’t accurate.