Title Text: In Quest of the Universe, Fourth Edition
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Explorations

Chapter 6: The Earth-Moon System

Earthquakes and Plate Tectonics
This US Geological Survey site includes a number of links on erthquake related topics, education resources, and articles on plate tectonics.
Visit the USGS - Earthquake topics web site
Tides (I)
In practice, tides are not simple. This is NOAA's National Ocean Service site, which provides a nice tutorial on tides. For predictions about tides for any coastal region of the US check NOAA's site http://www.co-ops.nos.noaa.gov/tide_pred.html.
Visit the Tides and Currents (I) web site
Tides (II)
This site provides a tutorial on tides and currents at a level that is higher than the level of the text.
Visit the Tides and Currents (II) web site
Auroras
This site includes two movies of auroras and additional related links.
Visit the Auroras web site