Introduction: Soils—The Earth’s Skin | SpringerLink
https://link.springer.com/chapter/10.1007/978-3-642-30942-7_1
WEBNov 25, 2015 · Terrestrial and semi-terrestrial soils are delimited at the bottom by solid or unconsolidated rocks, and at the top by vegetation cover and the interface with the atmosphere, with gradual transitions to neighboring soils. They consist of minerals of various types and sizes (Chap. 2 ), and of organic substances, the humus (Chap. 3 ).
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