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.
PBS
Pbs Teachers:yellowstone: Let's Go! Virtual Yellowstone Tour
Define the terms geyser, mud pot, hot springs, erosion and uplift. Identify the geologic wonders of Yellowstone National Park and write a description of the geologic features to be included on a map for a self-guided tour for park visitors.