Curated OER
Water Quality
Students use a microcomputer connected to a conductivity probe to measure the total dissolved solids in local area water samples. Students then compare their measurements with others in their class as well as other standard measurements.
Wikimedia
Wikipedia: Hot Spring
This website from the encyclopedia Wikipedia contains a definition for what a hot spring is, and tells how they differ from a geyser. Links are also provided throughout for additional information on related subjects.