1).What is mechanical weathering?\
2.)How do water, ice, wind, and organisms cause mechanical weathering?
ASAP

mechanical weathering  --is the process of breaking big rocks into little ones

when rivers or ocean waves cause rocks to collide and scrape against each other. Ice can cause mechanical weathering when glaciers cause rocks to scrape against each other. Ice can also cause mechanical weathering when water gets in cracks in rocks, and then freezes and expands.

Explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.