Volcanic activity can result in explosions called plinian eruptions that shoot rocks, ash, and gas hundreds of feet into the air. While not all types volcanic eruptions are so dramatic, they can all be dangerous. Fortunately, most volcanoes are carefully monitored, and scientists can usually provide some advance warning before a serious event. But if you live near a volcano or get an opportunity to visit one, you are always at risk, and it's important to know how to prepare for an eruption and escape one alive.