Take a little soil.
Break the clumps with your hand to powder it.
Now take a glass tumbler, fill it half with water, and then add a handful of soil to it.
Stir it well with a stick to dissolve the soil.
Now let it stand undisturbed for some time. Afterwards, observe it and the questions are answered here
Q. Do you see layers of particles of different sizes in the glass tumbler?
Yes
Q. Are there some dead rotting leaves or animal remains floating on water?
Yes, some of the roots are floating on the surface of water.
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