Volcanoes are one of the most interesting and impressive natural phenomena on Earth. Here are five facts about them that may surprise you:1. The word volcano actually comes from the Roman god Vulcan.2. Volcanoes can be found on every continent.3. The largest volcano in the solar system is Olympus Mons on Mars.4. The longest recorded eruption was of Kilauea in Hawaii, which lasted for over three years.5. Volcanoes are responsible for creating some of the most beautiful landscapes on Earth, such as the Hawaiian Islands and the Italian city of Pompeii.