Posted by Showcrop on May 03, 2010 at 14:58:01 from (75.67.231.80):
In Reply to: Re: rocks again posted by old on May 03, 2010 at 14:15:10:
Old, despite your many times proven wealth of knowledge, I have to dispute the idea that rocks float in wet mud. Try hanging onto a rock as you are sinking in quick sand. Or as you stir up mud and rocks spinning your tires why aren't the rocks floating? My hay fields grow plenty of rocks and they grow only slightly better in the wet areas. What happens is ice forms in the ground in cold areas of the world. Water expands as it freezes so all of the ground pushes up at rates related to how much moisture is there. during the course of heaving,(that's what we call it around here)and settling, grains of sand, small stones, pieces of dirt, fall down under the rocks, so as they settle back down in the spring, they never go back down quite as far as they came up. probably less than 1/8 of an inch a year but it's a tiny bit each year that there is frost. You can picture trying to pry a big rock from the ground. Every time that you let it back down it doesn't go back quite as far as it was. you would have to beat on it with a big hammer to displace some dirt to get it to go back down to where it was.
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