The Big Foto » mountains http://thebigfoto.com Life stories in photos Fri, 10 Feb 2012 07:47:56 +0000 en hourly 1 Volcano http://thebigfoto.com/volcano http://thebigfoto.com/volcano#comments Fri, 30 Jan 2009 10:00:36 +0000 admin http://thebigfoto.com/?p=121 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.

Volcanoes are generally found where tectonic plates are diverging or converging.

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.

Wikipedia

]]> http://thebigfoto.com/volcano/feed 4