LYCOS RETRIEVER 
Volcanoes: Earth
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Alaska contains over 100 volcanoes and volcanic fields volcanoes and volcanic fields which have been active within the last two million years. Over 40 of these have been active in historic time. These volcanoes make up about 80% of all active volcanoes in the United States and 8% of all active above-water volcanoes on earth.
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About 1,900 volcanoes on Earth are considered active, meaning they show some level of activity and are likely to explode again. Many other volcanoes are dormant, showing no current signs of exploding but likely to become active at some point in the future. Others are considered extinct.
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The more than 500 active volcanoes erupting around the world affect the Earth's atmosphere and global climate. As volcanoes erupt, they blast large clouds of gases, particles, water vapor, and aerosols into the atmosphere.
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