Check Out These Cool Facts About Volcanoes


  • 1,500 volcanoes that have erupted in the past 10,000 years.
  • Indonesia is home to the most active volcanoes on the planet.
  • The deadliest volcano in recorded history is Mount Tambora in Indonesia. When it erupted in 1815, it killed at least 71,000 people.
  • “Magma” is liquid rock inside a volcano.
  • When magma is above ground, it is called “lava.”
  • Erupting lava can reach 2,100 degrees Fahrenheit
  • An eruption column (volcanic ash exploding from the top of a volcano) can reach 34 miles high.
  • The most devastating eruption in U.S. history was Mount St. Helens on May 18, 1980.
  • There are 500 active volcanoes in the world today.
  • There are 50 eruptions Earth averages each year.
  • Nearly 75 percent of the world’s volcanoes can be found at the “Ring of Fire,” a 25,000-mile horseshoe border around the Pacific Ocean.
  • Volcanoes are also found on the ocean floor.
  • The biggest known volcano in our solar system is Olympus Mons. It’s on Mars and measures 374 miles in diameter (about the same size as the state of Arizona) and 16 miles high.

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