>Right - the phrase "weathered the way it is" refers to the
>differential weathering pattern, which is caused by the water
>runoff, not the other effects. The other effects don't cause
>the telltale weathering pattern - water runoff does.
"Precipitation induced weathering" is an erosion process... this is not really a term used in geology it is a construct of Dr. Schoch and a rather confusing one. Rainwater is supplying both the weathering mechanism, which is dissolution of calcite, and the agent that is removing the weathered rock away from the surface. Salt exfoliation (a weathering mechanism) can be produced by precipitation so you can effectively replace dissolution with salt exfoliation and get the same type erosion result. Salt exfoliation doesn't need rainwater to occur (other forms of mosture can induce it), so rainwater is adding to the rate of weathering in this case. The rate of weathering directly controls the rate of erosion, so that increases as well every time it rains.
Archae Solenhofen (email@example.com)