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Re: [APD] sand
On 18/09/2011 08:22, Bob wrote:
Careful, Stewart. A LOT of ocean beach sand is crushed coral. The
sand that builds up in freshwater streams and rivers is all kinds of
things, but not Calcium
I guess I forgot that. I always associate sand as coming from the beach.
It doesn't of course.
200 Million years in the making...
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