Though volcanologists study all types of volcanoes ... other famous volcanoes, including Mt. St. Helens and Mt. Vesuvius, are all andesitic volcanoes. Here, get to know the major features and ...

Volcanoes can look like small mountains or hills. A volcano is an opening in the Earth's crust that allows magma, hot ash and gases to escape. Composite volcanoes are the most common type of ...