Why do volcanos erupt only once in a while?

Subject: Why do volcanos erupt only once in a while?

Date: Mon Mar 24 19:15:51 1997
Posted by: Kate Frantz
Grade level: 7-9
School/Organization: St. Anthony Middle School
City: New Brighton State/Province: Minnesota
Country: USA
Area of science: Earth Sciences
Message ID: 859252551.Es

Message:

Why do volcanos erupt only once in a while?
Volcanos aren't erupting constantly.  Why not?  Why aren't they 
constantly blowing the insides of the earth out?  Also, why doesn't the
mantle of the earth run out of magma if these volcanos are constantly
blowing their tops?

Re:Why do volcanos erupt only once in a while?

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