why do volcanoes release so much carbon dioxide when they erupt?

Hi

Why do volcanoes release so much carbond dioxide when they erupt? Is it because limestone melts to release carbon dioxide or is there something else going on?

thanks
andiejeAsked:
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d-glitchCommented:
Google   volcanic c02 emissions

This seems to be a hot topic for the Climate Change Deniers.  
But it seems they don't actually release much compared to human activity.

http://news.discovery.com/earth/volcanoes-co2-people-emissions-climate-110627.html

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xmlmagicianCommented:
are we doing your homework for you:-)?
aburrCommented:
as d-glitch mentioned volcanoes are not the only things hot.
The lava burns anything in its path also
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Math / Science

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