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Large areas of Canada, for instance, have been eroded down to the Precambrian basement rock!The geologic history of the strata making up the Grand Canyon is as much a history of erosion as it is of deposition!
Thus, topsoil does not accumulate like most sediment, by simply piling up.
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.
The accumulating humus will also reach an equilibrium, when new material balances that lost by decay and oxidation.
(Topsoil is full of microbes that love to munch away on organic material, and don't forget the earthworms.
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 .
Consequently, there is a practical limit to how deep the soil can get even if erosion never occurs.Get help creating prescreening questions, creating job offers, and more.If university managers receive ACA documents on behalf of an employee that ask for plan verification, please forward them to the HR Benefits office on your campus. Add Yeah Jam Fury: U, Me, Everybody to your Steam wishlist and send a screenshot to yeahjamfury [email protected] a chance to win a copy of the game! 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?