Volcanoes are openings in the Earth's surface through which molten rock, ash, and gas can escape.
Over 1,500 active volcanoes worldwide, and many more dormant or extinct ones.
The word "volcano" comes from the name of the Roman god of fire, Vulcan.
Volcanoes can be found on every continent, including Antarctica.
The largest volcano in the solar system is on Mars, Olympus Mons.
Some volcanoes are underwater and can only be seen through submarines or remote sensing devices.
Volcanoes can have different eruptions, including explosive, effusive, and phreatic eruptions.
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