Not so long ago, people living near volcanoes had little that might help them to anticipate an eruption. A deep rumble, a puff of smoke, and ash might foreshadow a major volcanic event. Or a volcano might erupt with no warning at all. This interactive activity from NOVA illustrates some of the clues modern seismologists are using to better understand activity deep within a volcano, in hopes of improving their ability to predict eruptions.
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