How many super volcanoes are there in the world?

Answer

The Earth has approximately 20 known supervolcanoes, according to James Morgan, who write for the BBC News. What constitutes a "supervolcano" is not clearly defined, so the term is avoided in the literature, but it is often used in reference to two distinct phenomena.

According to Wikipedia, a supervolcano is any volcano that is capable of ejecting at least 1,000 cubic kilometers of rock in a single event. The term is used in connection with both large eruptions, such as occurred at Toba 78,000 years ago, and with large basaltic lava flows, such as the eruption of the Siberian traps.

Q&A Related to "How many super volcanoes are there in the world..."
There are seven super volcanoes (or megacaldera) in the world. Yellowstone, Long Valley, and. Valles Calderas in the United States; Lake Toba, North Sumatra, Indonesia; Taupo Volcano
http://wiki.answers.com/Q/How_many_super_volcanoes...
I would guess that there are about 10. There's Long Valley and Yellowstone in US. http://en.wikipedia.org/wiki/Supervolcan…. This one is interesting. Note: One volcano can
http://answers.yahoo.com/question/index?qid=200806...
Arenal Arenal volcano is located in the northern region of Costa Rica. It is 7,000 years old and has been quite active since July 1968, according to the World Organization of Volcanic
http://www.ehow.com/how_5170535_many-volcanoes-the...
There are approximately 1,500 active volcanoes worldwide.A volcano is considered active
http://www.chacha.com/question/how-many-volcanoes-...
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