Re: REF: frost heaving

<http://www.aip.org/png/html/frost.htm>
and
<http://en.wikipedia.org/wiki/Frost_heaving>
The unexpected things I learn in this group - never realized frost heaving was so complicated! Or that it's worse in silt than in either sand <or> clay. 
--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
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