The Academy of Natural Sciences (Philadelphia) hosts this page on Urban Rivers Awareness. Offering information both general (e.g., the importance of water and watersheds) and specific (e.g., Manatwany Creek dam study), the site introduces viewers to urban river issues via an ecological study on the removal of a dam in Pennsylvania. Site content is directed towards raising awareness of urban rivers...

Some of the most fascinating natural phenomena in the world are waterfalls. Cascading over and through the geological remnants of the earth's history, the water of the world falls, creating the familiar sounds of gurgling, crashing water. This topic in depth takes you on a tour of a few great websites devoted to waterfalls around the world and the U.S. The World Waterfall Database (1) site,...