| UPDATED: 09:20, Thu, Mar 18, 2021 Link copied Sign up for FREE for the biggest new releases, reviews and tech hacks SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Volcano eruptions happen almost once every four days across the entire world, with up to 80 usually record in any given year. But eruptions on Earth would look entirely different to those on other planets or asteroids, scientists have revealed, because not all planets are made entirely of rock.