Scientists record the strength of earthquakes on delicate instruments called seismographs. They also use seismographs to find exactly where an earthquake started. Scientists have noticed that earthquakes often occur in areas where there are volcanoes.

To learn more about earthquakes and plate tectonics:

1. Go to the All Shook Up WWW Sheet and print it.

2. Visit this Web site.
    Seismic Monitor

3. Visit this Web site. On this map, the bigger the circle, the bigger the earthquake was! Then complete the WWW Sheet.
    Worldwide Earthquakes