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This lesson plan, authored and curated by David P. Stern, introduces the concept of energy through the ideas of conservation and the ability to run machines. A series of both qualitative and quantitative examples are...
This resource explains how the oceans became salty. Topics include the source of the salt, how rainwater dissolves rock and carries the material away as dissolved ions, and the two most common ions in seawater. A link...
This site is the homepage of the United States Geological Survey's (USGS) Landslide Hazards Program (LHP). Materials available include an overview of the geologic hazard presented by landslides, a discussion of the...
This report summarizes the Volcano Hazards Program of the United States Geological Survey (USGS). Topics include its goals and activities, some key accomplishments, and a plan for future operations. There are also...
This applet shows the concept of superposition of waves. Two waves with the same amplitude and wavelength move in opposite directions and their sum is shown. Users may turn the interactive applet on and off.
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