Soil primarily had its beginning from rock together with animal and vegetable decay, if you can imagine long stretches or periods of time when great rock masses were crumbling and breaking up. Heat, water action, and friction were largely responsible for this. By friction here is meant the rubbing and grinding of rock mass against rock mass.
Think of the huge rocks, a perfect chaos of them,
bumping, scraping, and settling against one another. What would be the result?
Well, I am sure you all could work that out. This is what happened: bits of rock were worn off, a great deal of heat was produced, and pieces of rock were pressed together to form new rock masses, some portions becoming dissolved in water. Why, I myself, almost feel the stress and strain of it all. Can you?
Then, too, there were great changes in temperature. First everything was heated to a high temperature, and then gradually became cool. Just think of the cracking, the crumbling, and the upheavals that such changes must have caused!
You know some of the effects in winter of sudden freezes and thaws. But the little examples of bursting water pipes and broken pitchers are as nothing to
what was happening in the world during those days. The water and the gases in the atmosphere helped along this crumbling work.
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