Question

What is meant by freezing of joints and bed of rock?

Answer 1

Mechanical weathering is the process of breaking bigrocks into little ones. This process usually happens near the surface of the planet. ... That process occurs when the water inside of rocks freezes and expands. That expansion cracks the rocks from the inside and eventually breaks them apart.

Rocks can slowly break down by a mechanism known as freeze-thaw weathering, or alternatively, frost wedging. Water seeps into cracks in rocks, freezes, then expands (since ice occupies a slightly larger volume than liquid water). This expansion pushes the sides of the cracks further apart.