Mt St Helens1

Mt St Helens1 hat Causes A Volcano? It was once sentiment that volcanic clacks were the result of water moving into highly alter ara of the earth. That not true any more. More recently, with the give way understanding of the movement of the earths crust home bases, known as musical scale tectonics, has been accepted as generating the energy that causes a volcanic eruption. (Microsoft, Encarta) Volcanoes stratum at the site of 2 kind of plate boundaries. The merging(prenominal) plate plunges under another divergent plate. The lower plate is drawn down to a depth at which it becomes molten, or a liquid hot magma. This magma is always flowing, like a rivers current.

But sometimes the crust and the upper mantle are not always even, if rising magma gets though a gap, crack, or weakness between the 2 plates a volcanic eruption forms. Scientists call these plate margins. Mt. St. Helens was considered to be in a yen state of dormancy, one that lasted 123 years. Usually after a hanker state of dormancy t...If you want to get a complete essay, order it on our website: Ordercustompaper.com

If you want to get a full essay, wisit our page: write my paper