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DanaC · 08-12-2007, 05:22 PM

Yup. It's a safety valve of some kind, I think. Probably why it's to be found so extensively in nature.

08-12-2007, 05:22 PM	#91
DanaC We have to go back, Kate! Join Date: Apr 2004 Location: Yorkshire Posts: 25,964	Yup. It's a safety valve of some kind, I think. Probably why it's to be found so extensively in nature.