organic horizon
41Corexit — A U.S. Air Force Reserve plane sprays dispersants over the Deepwater Horizon oil spill in the Gulf of Mexico. Corexit[1] (often styled COREXIT)[2] is a product line of solvents …
42Nutrient cycle — …
43Benzene — For other uses, see Benzene (disambiguation). See also: Benzole Benzene …
44comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… …
45Gelisols — Gelisol a Gelisol profile Used in: USDA soil taxonomy Profile: OAC …
46Agriculture biologique — Pour les articles homonymes, voir Label d agriculture biologique et Label Agriculture Biologique. L’agriculture biologique est une méthode de production agricole basée sur le respect du vivant et des cycles naturels[1], qui gère de façon globale… …
47Brown earth — is a type of soil. Brown earths are mostly located between 30° and 55° north of the Equator. The largest expanses cover western and central Europe, large areas of western and trans Uralian Russia, the east coast of America and eastern Asia. Here …
48Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… …
49United Kingdom — a kingdom in NW Europe, consisting of Great Britain and Northern Ireland: formerly comprising Great Britain and Ireland 1801 1922. 58,610,182; 94,242 sq. mi. (244,100 sq. km). Cap.: London. Abbr.: U.K. Official name, United Kingdom of Great… …
50Methane clathrate — Burning ice . Methane, released by heating, burns; water drips. Inset: clathrate structure (University of Göttingen, GZG. Abt. Kristallographie). Source: United States Geological Survey. Methane clathrate, also called methane hydrate,… …
