Related topics: volcano

Jurassic world of volcanoes found in central Australia

An international team of subsurface explorers from the University of Adelaide in Australia and the University of Aberdeen in Scotland has uncovered a previously undescribed Jurassic world of around 100 ancient volcanoes buried ...

Ancient drop of water rewrites Earth's history

The remains of a microscopic drop of ancient seawater has assisted in rewriting the history of Earth's evolution when it was used to re-establish the time that plate tectonics started on the planet.

Image: Mount Fuji, Japan

The Copernicus Sentinel-2 mission takes us over Mount Fuji, Japan's highest mountain standing at 3776 metres tall. In this spring image, the mountain can be seen coated in pure white snow.

Firepits of the Gods: Ancient memories of maar volcanoes

In the heart of Takapuna, north-central Auckland, is a natural lake—Pupuke—while a little way offshore lies the volcanic Rangitoto Island. Long ago, a family of giants lived at Takapuna until one day, ill-advisedly, ...

Volcanic eruption witnessed by prehistoric humans

A volcanic eruption believed to be eye-witnessed by humans in prehistoric times happened 245,000 years later than originally expected, according to new research involving Curtin University researchers.

page 1 from 23

Volcano

A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time. The word volcano is derived from the name of Vulcano island off Sicily. In turn, it was named after Vulcan, the Roman god of fire.

Volcanoes are generally found where tectonic plates are diverging or converging. A mid-oceanic ridge, for example the Mid-Atlantic Ridge, has examples of volcanoes caused by divergent tectonic plates pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by convergent tectonic plates coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another. Volcanoes can also form where there is stretching and thinning of the Earth's crust (called "non-hotspot intraplate volcanism"), such as in the African Rift Valley, the Wells Gray-Clearwater volcanic field and the Rio Grande Rift in North America and the European Rhine Graben with its Eifel volcanoes.

Volcanoes can be caused by mantle plumes. These so-called hotspots, for example at Hawaii, can occur far from plate boundaries. Hotspot volcanoes are also found elsewhere in the solar system, especially on rocky planets and moons.

This text uses material from Wikipedia, licensed under CC BY-SA