Volcano Eruptions

Volcanic activity is reflecting how often a volcano erupts, if at all. Some volcanoes are erupting often, others haven't in centuries and finally, some have not been erupting in thousands of years of even since the Ice Age.

Scientists classify the volcanic activity on a three levels scale. The levels are: active, dormant and extinct. An active volcano can erupt on a regular basis or periodically, for example, every ten years. The dormant volcano can be inactive over a long period of time, for example over a century and then all of a sudden, it has an eruption. The extinct volcano has been inactive for thousands of years and shows no sign of ever erupting again.