Re: How do scientists date rocks?

There are probably a large number of ways in which rocks can be dated.  The 
dates of some rocks, for instance, might be estimating by noting the age of the 
layer of rock in which the rock was found.  I believe the method you are asking 
about is referred to as carbon dating.  An excellent educational site on carbon 
dating is the following

http://members.aol.com/dsfrink/ocr/ocrpage.htm

which also provides links to other related sites you may be interested in.

I hope this helps.

Thanks for your question.

sid