Tall, steep-sided volcanoes are made from layers of ash, rock, and lava . These are called composite or stratovolcanoes . They can erupt violently. One of the most famous is Mount St. Helens in Washington state.
Tall, steep-sided volcanoes are made from layers of ash, rock, and lava . These are called composite or stratovolcanoes . They can erupt violently. One of the most famous is Mount St. Helens in Washington state.
