This is a picture of cement cracking, which is an example of mechanical weathering as a result of plant growth.This is a picture of cement cracking. This is an example of chemical weathering
This is a picture of a sewer cap rusting and eroding. Rusting objects are caused by acid rain, or chemical weathering.
This is a picture of a stain on the concrete. This stain is caused by water, an important source of chemical weathering
