Science Education Resource Center at Carleton College
Serc: Investigating Ponds and Streams: How Clean Is Our Water?
In this field lab, students investigate the differences in three city ponds. Students will compare pond life, temperature, pH, Ammonia, dissolved oxygen, and Nitrate. The student use the pond sheets (Flinn Scientific Catalog 2007) to...
US Geological Survey
U.s. Geological Survey: Rain
At this site from the U.S. Geological Survey you can find out what makes rain such a valuable resource. Included is a chart that tells how much rain different cities in the United States receive. Click Home to access the site in Spanish.