minerals to rocks, rocks to soil, but how?

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paul.fr

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minerals to rocks, rocks to soil, but how?
« on: 20/08/2007 16:26:56 »
i hear that minerals will eventually become rocks, which inturn become soil. but how?

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Offline Bass

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minerals to rocks, rocks to soil, but how?
« Reply #1 on: 20/08/2007 17:05:55 »
minerals + heat and pressure = rocks
rocks + erosion = soils
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Offline pete_inthehills

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minerals to rocks, rocks to soil, but how?
« Reply #2 on: 21/08/2007 12:49:31 »
I like to think of this not as two seperate equations, but one big cyclical one.

rocks + erosion + organic matter = soil; soil + heat + pressure = rocks; rocks + erosion....round and round and round

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Offline _Stefan_

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minerals to rocks, rocks to soil, but how?
« Reply #3 on: 21/08/2007 13:39:46 »
Can rock be formed by pressure without heat? Like the different layers of soil and rock you find as you dig deep deep down?
Stefan
"No testimony is sufficient to establish a miracle, unless the testimony be of such a kind, that its falsehood would be more miraculous than the fact which it endeavors to establish." -David Hume

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Offline eric l

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minerals to rocks, rocks to soil, but how?
« Reply #4 on: 21/08/2007 14:32:41 »
Can rock be formed by pressure without heat? Like the different layers of soil and rock you find as you dig deep deep down?
I remember being shown formations consisting of a kind of natural concrete. 
Wikipedia has an article on such agglomerates :  http://en.wikipedia.org/wiki/Clastic_rock
"Wonder is no wonder" (Simon Stevin 1548-1620)

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Offline pete_inthehills

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minerals to rocks, rocks to soil, but how?
« Reply #5 on: 21/08/2007 22:14:40 »
often the pressure comes from burial and that causes heat as well, but I do remember something about pressure alone causing minerals to bond.  It was something like pressure melting or some such.  And there is the usual biological/chemical factors.  Oolites are a good example.  A grain of sand rolls around on a lime mud sea floor, gets a coating of lime mud and they eventually chemically bond to make an oolite.  So yeah, you don't need heat, but they often work together.

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