how does mechanical weathering take place?

Answer 1

Mechanical weathering occurs through freezing/thawing, plant roots that grow in cracks, gravity-related processes such as rolling and toppling, stream-driven rounding of rocks when the rocks bang together during high flows, sand blasting from wind-driven sand . . . there's probably many more, but it's all i can think of.

Answer 2

Two main classifications of weathering processes exist. Mechanical or physical weathering involves the breakdown of rocks and soils through direct contact with atmospheric conditions such as heat, water, ice and pressure.