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10 Interesting Facts to Know About Volcanoes

Updated on September 30, 2010

What do you know about volcanoes? Unless you live in an area like Hawaii that happens to be known for its volcanoes, you might not know a lot about them. However, people who have never had to think about volcanoes before are starting to take an interest in them lately since news of the Icelandic volcano has hit the headlines.

If you’re curious about volcanoes then you might be interested in these ten volcano facts and tidbits:

1.     Volcanoes are either explosive or effusive. If a volcano is explosive then it explodes into the air, distributing ash all over the place. Clearly, the Icelandic volcano is explosive. If a volcano is effusive then it doesn’t explode ash into the air. Instead, it oozes lava. Effusive eruptions build up gently and involve very hot magma reaching the surface. In contrast, explosive eruptions build up quickly and involve cooler magma temperature. Lava can be present in explosive eruptions (and may even explode dangerously into the air) but the lava won’t flow as much.

2.     Volcanoes float in water. Well, kind of. The volcanic rock pumice floats in water. In fact, it is the only rock that we know of that is capable of floating in water. It does this because of the way it forms which includes the formation of a bunch of bubbly air holes. The result is a lightweight rock that floats in water.

3.     There are a lot of active volcanoes. There are at least 1500 active volcanoes around the world today. This doesn’t mean that they are all erupting now but rather than they are capable of erupting. There are about forty active volcanoes in the continental United States. There are another 60 in Alaska alone. The place with the most active volcanoes, however, is Indonesia.

4.     Volcanoes grow and they also die. Volcanoes can grow in size. They are basically big mountains. When lava and ash accumulate, they can get taller. However, volcanoes can also die or become extinct. If a volcano has been around for a very very long time and it hasn’t erupted and it isn’t believed that it will erupt then it’s considered extinct. It’s more or less just a mountain at this point.

5.     Mars has the tallest volcano in the solar system. Volcanoes on Mars are different than those here on Earth. Here on Earth we have tectonic plates. Volcanoes generally form at the spots where tectonic plates either come together or pull apart. Mars doesn’t have tectonic plates, though. Instead, the volcano that formed on Mars formed from just a single spot of boiling heat that gathered energy over time. The result is the tallest volcano in the solar system.

6.     You should head inside if you’re ever in an area where there is an eruption. The eruption from a volcano releases a lot of stuff into the air that isn’t very healthy for you to breathe. For that reason, it is recommended that people stay inside immediately following a volcanic eruption. They should take their pets inside with them to keep them safe. All doors and windows should be shut and fans should be turned off to prevent the unhealthy air from circulating.

7.     Volcanoes are named after a Roman god. The name “volcano” comes from the origin of the name Vulcan who was the Roman god of fire. Vulcan was the blacksmith of the Roman gods. He used fire to make weapons and tools for the other gods. The way that ash erupts from some volcanoes could be reminiscent of a blacksmith god at work.

8.     The loudest sound ever heard by man was the sound of a volcano exploding. It is believed that the loudest sound ever heard by a human being was the sound heard during the third explosion of a multiple-explosion eruption that happened in 1883. The Krakatoa volcano in Indonesia erupted multiple times over the course of several months. At one point it reached its pinnacle and exploded with enough force to be heard by people living over two thousand miles away! It reached 180 decibels which is enough to instantly make a nearby human being go deaf.

9.     A volcano erupting can be a good thing. Sometimes an ecosystem is unbalanced and the eruption of a volcano in the area can essentially provide a fresh start for life there. This is similar to the way that a fire can ultimately refresh an area even though it may initially cause devastation there.

10. Movies about volcanoes don’t seem to do well with critics. There have been several movies about volcanoes but none of them did well with critics. In 1997, Dante’s Peak and Volcano were both released and did well at the box office but didn’t receive very good reviews from critics. The first big movie starring Meg Ryan with Tom Hanks was a comedy about a volcano (Joe Versus the Volcano) which didn’t do nearly as well as Sleepless in Seattle or You’ve Got Mail, the two movies that the pair did together later.

There is a lot that can be learned about volcanoes. The way that they form, the different types that there are and the destruction that they can do are all fascinating topics worthy of further exploration. These ten tidbits are just the tip of the so-called iceberg when it comes to what there is to know about these wonders of the earth.


Submit a Comment
  • profile image

    hi my name is cllcmmy 

    6 years ago

    i like pics you put on your website

  • profile image

    cool beans 

    7 years ago

    You know something, this is very cool beans!!!!!!!!!

  • profile image


    7 years ago

    I love volcanoes:)

  • Truefactory profile image

    hitesh patel 

    7 years ago from india

    Learn many things about volcanoes in short time

  • profile image


    7 years ago

    it was my home work

  • profile image

    darren lloyd moty 

    7 years ago

    i had 2 teach da clas on valcanoes nd now i got n a+ for it

  • profile image


    7 years ago

    I had to do homework on volcanic eruptions....10 facts. I found everything I needed to know here!!! Great job and keep up the good work!! : )

  • profile image


    7 years ago

    cool hope i get an A!

  • profile image


    7 years ago

    i hope this is accurate for my project

  • MarkMAllen15 profile image


    8 years ago

    Awesome facts!

  • profile image


    8 years ago

    no info

  • profile image


    8 years ago

    Cool i have a science project and this really helped! :)

  • profile image


    8 years ago

    I got an f cos of this info

  • profile image


    9 years ago

    I got an A on an assignment because of this info

  • The Rising Glory profile image

    The Rising Glory 

    9 years ago from California

    Interesting...I enjoyed and learned a couple of things. Thanks!

  • Cheeky Girl profile image

    Cassandra Mantis 

    9 years ago from UK and Nerujenia

    As a Hubber who just wrote a Hub about the Icelandic volcano, I am fascinated by this subject. And it is very newsworthy these days. Some great information here. Thanks for this!

  • BkCreative profile image


    9 years ago from Brooklyn, New York City

    Great information. Just in case we think we can control Mother Nature - these volcanoes are a reminder of the beauty and power of nature!

    Thanks for such a timely hub!

  • katiem2 profile image

    Katie McMurray 

    9 years ago from Westerville

    No joke hey this Volcanoe stuff is very interesting. Volcanoes sound a bit as if their a planet in themselves. Great Hub and Fab Read. Thanks and Peace :)

  • king_saberhawk profile image


    9 years ago

    Nice Hub, admittedly I didn't know a few of the facts on here.

  • profile image


    9 years ago

    The most important thing I know about volcanoes is that the Icelandic one kept me from flying into Europe this weekend to catch a cruise and ruined my 10-day vacation. :-(


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