The U.S. Geological Survey (USGS) and the Food and Agriculture Organization of the United Nations (FAO) have teamed up to create a water-cycle diagram for schools. Use the interactive version and download printable files of the diagram.

This page discusses the presence of arsenic (chemical symbol As) in ground water in the United States. Also provides many links to other sites about arsenic (especially in drinking water.)

This photo shows a completed chromatography chemistry experiment. The colors have clearly separated from each other along the piece of paper. The original black ink was separated using an ethanol and water mixture solvent.

This rotation symbol can be used to mean a number of different things. It could represent recycling, a round about traffic sign or the circulation process of water. It is blue and features three large white arrows.

A group of rafters head down the rapids of a river used for white water rafting.