What is the number 1 biggest volcano in the world?
Mauna Loa, which means long mountain in Hawaiian, is the largest active volcano in the world. It covers 2,035 sq miles (5,271 sq km), and is one of a chain of five volcanoes which form Hawaii's Big Island. This one volcano alone comprises half of the whole island.
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Nestled in the San Juan Mountains, there is ample evidence of one of the largest known volcanic eruptions on the planet: a caldera 22 miles wide and 62 miles long. It's called the La Garita Caldera, and it rivals the Toba eruption in Indonesia and all Yellowstone eruptions.
Yellowstone Supervolcano (Wyoming, United States) Effects of a major eruption: When the Yellowstone Caldera, or supervolcano, in Yellowstone National Park erupts again, its effects would be worldwide, the U.S. Geographical Survey said.
The Yellowstone supervolcano last erupted about 640,000 years ago. A sleeping giant is nestled in the western part of the United States. Though it stirs occasionally, it has not risen from slumber in nearly 70,000 years.