“Pothole in Yosemite granitic rock. Sentinel Dome. Chemical and physical processes enlarge holes over time. Water is a polar molecule and acts as a chemical solvent, causing weathering of granite around the hole Standing water in pothole causes granite to disintegrate= auto cyclic reaction.
This tree is the famous Ansel Adams photo: http://thetuncluer.files.wordpress.com/2007/07/ansel-adams-jeffrey-pine-sentinel-dome.jpg”