There are three main types of weathering know as physical,biological and chemical.
Physical weathering: Freeze-thaw action
- The first thing that happens is there is a little crack in a rock and water gets trapped inside.Then when it gets cold around -5C the water freezes. The pressure on the rock created by 9% increase in volume as the water freezes therefore the crack increased in size
Biological Weathering
- A seed falls into a crack,then it rains so the seed starts to grow,roots force their way into cracks and as the roots grow they break up the rock.
- Another way is by humans/animals burrowing or digging can also break up rock.
Chemical Weathering
-Rain water contains natural acids. So the carbonates in limestone are dissolved by weak acids therefore the cracks expand.
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