Volcanoes are grouped into four types: cinder cones, composite volcanoes, shield volcanoes and lava volcanoes. Cinder cones are circular or oval cones made up of small fragments of lava from a single ...

Volcanoes repeatedly remind people of Earth's potential for violence. Since 1700, volcanic eruptions have killed more than 250,000 people and devastated scores of communities. What causes these ...

There are two main types of volcano - composite and shield. The two types of volcano form in different places and have very different characteristics. Ash released from shield volcanoes often builds ...

Have students list and then share what they know about volcanoes. Where are volcanoes found? How are they formed? Do all volcanoes give off the same type of material? (Volcanoes emit lava, tephra or ...

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 volcano.

How do volcanoes work? What happens beneath their surface? What causes the vibrations—known as tremor—that occur when magma or gases move upward through a volcano's conduits? Professor Dr. Miriam ...

It comes as no shock that a potentially new type of volcanic lightning had long eluded scientists: The bolts can be as short as about 3 feet (1 meter) long and last just a few milliseconds. But ...