age of rocks

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From: Sally Seebode (sseebode@earthlink.net)
Date: Wed Dec 08 1999 - 08:05:27 PST 

Message-ID: <384E81C3.46E6@earthlink.net>
Date: Wed, 08 Dec 1999 16:05:27 +0000
From: Sally Seebode <sseebode@earthlink.net>
Subject: age of rocks

Hi all;
Last night I was attending my regular Tuesday Ed class accumulating
credits and listening to the fabulous Paul Doherty. He was talking about
magnetism, and I forgot to ask how we know the age of rocks? It's
obviously not carbon dating, but is there another radioactive substance
that all rocks contain? or is there a totally different method?

So, I'm asking all of you: How do scientists determine the age of rocks?

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