Thursday 25 September 2008

Yr13: Minor volcanic features

Solfatara - note the yellow sulphur on the rocks surrounding it. The name solfatara is given to fumaroles that emit sulphurous gases.

Mud Volcano or mudpot form in high-temperature geothermal areas where water is in short supply. The little water that is available rises to the surface at a spot where the soil is rich in volcanic ash, clay and other fine particulates.




Fumarole is an opening in Earth's (or any other astronomical body's) crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, sulphur dioxide, hydrochloric acid, and hydrogen sulphide
Geyser is a hot spring characterized by intermittent discharge of water ejected turbulently and accomplished by a vapour phase. The name geyser comes from Geysir, the name of an erupting spring at Haukadalur, Iceland; that name, in turn, comes from the Icelandic verb gjósa, "to gush".

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