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Take the soil in my mother's backyard, for example.After about 18 inches the soil grades into a two-foot matrix of solid, smooth clay mixed with boulders.(Topsoil is full of microbes that love to munch away on organic material, and don't forget the earthworms.Those earthworms don't get their calories from rock and clay!) Just because a patch of topsoil takes x centuries to build up doesn't mean that the land is x centuries old.Most likely, that topsoil began to build up only recently, geologically speaking, and has either reached a practical limit to its depth or has been subject to erosion.It is no longer a paradise for bacteria, and fungi.
Where sediment is neither being collected nor eroded, soils necessarily take their mineral components from the underlying parent rock.
Those "scientific" creationists who trot this plum about must be delirious!
Do they really believe that we should wind up with x miles of topsoil (or some such nonsense) after billions of years?
Sudden changes in temperature will have a smaller effect on the deeper parent rock.
With the exception of the organic content, drawn mostly from the atmosphere, and the larger volume that broken rock takes up (which may raise the soil some distance above the original surface), in situ soils build .