Tuesday, February 08, 2005
What is volcanic activity?
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.