PRESENTATION OUTLINE
Animals such as moles gophers and other animals burrow in the ground loosen and break apart rock.
When water freezes in a rock's cracks it makes the cracks bigger. The process of frost wedging can also widen the cracks
Plant roots enter rocks and as they grow they force the cracks apart. Even small plants can pry apart cracked rocks
erosion removes material from the surface of a mass of rock pressure is reduced. The release of pressure causes the outside of the rock to crack and flake
Sand and other rock particles that are carried by wind, water, or ice can wear away exposed rock
