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Journal Article How Deep Is Soil? Soil, the zone of the earth's crust that is biologically active, is much deeper than has been thought by many ecologists Get access Daniel D. Richter, Daniel D. Richter Search for other works by this author on: Oxford Academic Google Scholar Daniel Markewitz Daniel Markewitz Search for other works by this author on: Oxford Academic Google Scholar BioScience, Volume 45, Issue 9, October 1995, Pages 600–609, https://doi.org/10.2307/1312764 Published: 01 October 1995
Richter et al. (Sun,) studied this question.