The importance of rock type and structure on weathering and erosional forms. Some rocks are more easily eroded than others, either 1. Because they have more fractures and cracks in them, or 2. Because they are composed of softer materials. B. Jointing patterns .
Joints are small fractures in rocks.
Once joints form, water seeps into these cracks. Joints become the main sites of chemical and physical weathering. Some rocks are more jointed than others. Stone Mountain is a nice example of a solid hunk of granite with few joints, so it stands above the more easily eroded rocks of the surrounding landscape. C. Rock resistance and differential erosion .