When thick magma and large amounts of gas build up under the surface, eruptions can be explosive, expelling lava, rocks and ash into the air. Less gas and more viscous magma usually mean a less dramatic eruption, often causing streams of lava to ooze from the vent.

Your Comments, Thoughts, Questions, Ideas

bryan kennedy's picture

Hey elberosorio, this post is copied from a National Geographic article on volcanoes. Please don't just copy and paste other site's work in the blogs. It's totally cool to post a link to the National Geographic website with some information about why you think this is an important current science website that people should check out.

posted on Wed, 10/15/2008 - 10:48am
sugar bear's picture
sugar bear says:

i saw a movie on volcanos

posted on Thu, 10/30/2008 - 11:56am

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