Geography 2152F/G Lecture Notes - Lecture 8: Dacite, Andesite
24 Apr 2014
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Types of volcanoes: volcanoes are classified into 4 different types, the classification is based on their shape, appearance, and style of eruptions, types of volcanoes: o o o o. Hot springs and geysers: heated groundwater can discharge at the surface as a hot spring, groundwater that boils in an underground chamber to periodically produce a release of steam or water is called a geyser. o o a lot of pressure build up very rare, there are approximately 1000 geysers on earth and nearly half are located in yellowstone national park (located in a very small area) Super eruptions: these are the products of supervolcanoes and are extremely rare events, they occur when large volume of magma rises to shallow depths in the crust over a hot spot (rare, yellowstone is a super volcano, yellowstone is inland from the coast, the magma is unable to break through the crust; pressure builds until the crust can no longer contain it.
