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Ordinary volcanoes are formed by a column of very hot molten rock, known [ ] magma, rising to the Earth's surface from deep within the Earth's core. This type [ ] volcano usually erupts from the top of a cone-shaped mountain, such as the famous volcano, Vesuvius, near Naples in Italy. However, there is [ ] kind of volcano, called a supervolcano.

It is one of the [ ] destructive forces in nature but also one of the least understood. One thing that is known, though, is that if a supervolcano occurs, it [ ] lead to mass extinction of species, and one species in particular [ ] will be under threat is the human race.

So what is a supervolcano exactly and [ ] often do they occur? A supervolcano is basically a huge reservoir, or lake, of boiling magma that lies close to theEarth's surface. They [ ] found in six different regions of the planet. One of the most famous supervolcano regions is in Yellowstone Park in Wyoming, USA. This park is [ ] area of outstanding natural beauty but it is also a sleeping giant that could wake [ ] at any time. The last time the area erupted was [ ] than 600,000 years ago and a new eruption is now overdue. When it does erupt, because [ ] day it will, it will virtually destroy the USA. And the dust cloud it creates will block [ ] the sun causing the Earth's temperature to plummet threatening the whole planet with mass extinction.