Here's why:
* Physical weathering breaks rocks down into smaller pieces without altering their chemical makeup. This can happen through various processes like:
* Frost wedging: Water freezes in cracks and expands, putting pressure on the rock and causing it to break apart.
* Thermal expansion and contraction: Rocks expand when heated and contract when cooled. If these changes happen rapidly, they can create stress that breaks the rock.
* Abrasion: Rocks are worn down by friction, often from wind-blown sand or water carrying sediment.
* Root wedging: Plant roots can grow into cracks in rocks, exerting pressure and causing them to break.
Chemical weathering, on the other hand, involves chemical reactions that alter the mineral composition of the rock. This can lead to the formation of new minerals, dissolution of existing minerals, or changes in the structure of the rock.
Let me know if you'd like more detail on any of these types of weathering!
