Eruption
When a volcano releases rock, ash, gas, or lava at the surface. Eruptions can be a quiet ooze of lava or a violent blast that sends ash kilometres into the sky. They can last hours, or they can last years.
Evacuation
Moving people out of a dangerous place before trouble arrives. A good evacuation has clear routes, enough time, and a plan that the people being moved have heard about before the emergency starts.
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