Volcanoes have the capacity to produce widespread destruction by covering cities and towns with ash and lava. However, volcanic eruptions also create islands, and the minerals in volcanic ash stimulate plant growth. More »

Volcanoes are caused by movement of tectonic plates within the earth's crust or along ocean floors, and produce primary and secondary effects upon eruption. Volcanoes may form when tectonic plates move away from one anot... More »

The primary impact volcanoes have on the environment is the release of volcanic gases into the atmosphere. Volcanoes release around 130 million tons of carbon dioxide each year, as well as toxic pollutants like sulfur di... More »

www.reference.com Science Earth Science Volcanoes

Composite volcanoes, also known as stratovolcanoes, are formed by the gradual deposition of alternating layers of volcanic lava and ash. When volcanoes erupt, emitting lava that flows very slowly, the lava cools and hard... More »

Composite volcanoes, one of the two main types of volcanoes along with shield volcanoes, are composed of alternating layers of lava and ash or other volcanic debris. These volcanoes are usually cone shaped with steep sid... More »

A super volcano is a volcano that has the potential of creating more than 1,000 cubic kilometers of ash, pumice, and lava during a single eruption. Super volcanoes erupt very rarely and may go hundreds of thousands of ye... More »

www.reference.com Science Earth Science Volcanoes

Noxious fumes and tremendous amounts of ash and molten lava spewed from Mount Etna in 1669 and killed more than 20,000 Sicilians. Just prior to this eruption, an associated earthquake killed an additional 15,000 people. More »

www.reference.com Science Earth Science Volcanoes