http://nerrs.noaa.gov/doc/siteprofile/acebasin/html/envicond/soil/slform.htm A number of conceptual models of soil formation have been postulated over the years. The two that have been key in our basic understanding of soils and soil formation…
http://www.earthwormsoc.org.uk/earthworm-information/earthworm-information-page-3 Soil structure Earthworms have been called ‘ecosystem engineers’. Much like human engineers, earthworms change the structure of their environments. Different types of earthworms can make both horizontal and vertical…
http://broome.soil.ncsu.edu/ssc012/Lecture/topic8.htm Physical Properties Features of the soil profile and the soil horizons are often described in the field in terms of the soil’s physical properties. Horizons are defined based on…