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Because evacuation plans rely on knowledge of when the volcano might erupt and how it will behave when it does erupt, we will next discussion predicting volcanic eruptions and volcanic behavior.An extinct volcano is a volcano that has not shown any historic activity, is usually deeply eroded, and shows no signs of recent activity.

In addition, volcanic tremor, as noted above, can also be indication that magma is moving below the surface.

Mitgation of Volcanic Disasters The best mitigation against casualties from volcanic eruptions is to provide warning based on eruption forecasts and knowledge of the past behavior of the volcano, and call for evacuations.

Little can be done to protect property as the energy involved in volcanic eruptions is too great and few structures will survive if subjected to volcanic processes.

This record is not preserved on Earth because all rocks formed during the first 800 million years of Earth's history were recycled back into the interior.

The importance of the Moon in studying the principles of geology is that it provides an insight into the basic mechanics of planetary evolution and events that occurred early in the solar system.