CoboCards App FAQ & Wünsche Feedback
Sprache: Deutsch Sprache
Kostenlos registrieren  Login

Zu dieser Karteikarte gibt es einen kompletten Satz an Karteikarten. Kostenlos!

Alle Oberthemen / Geography / General / Geography
11
What is a volcanic mountain?[http://en.wikipedia.org/wiki/File:MtCleveland_ISS013-E-24184.jpg]
A volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, ash  and gases to escape from below the surface. The word volcano is derived from the name of Vulcano island off Sicily which in turn, 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.
Neuer Kommentar
Karteninfo:
Autor: marta.reichert
Oberthema: Geography
Thema: General
Veröffentlicht: 08.06.2010

Abbrechen
E-Mail

Passwort

Login    

Passwort vergessen?
Deutsch  English