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51Corn Snake — Conservation status Least Concern (IUCN 3.1) …
52Cryptanalysis of the Enigma — enabled the western Allies in World War II to read substantial amounts of secret Morse coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military intelligence which, along with that from… …
53Sand casting — Sand casting, also known as sand molded casting, is a metal casting process characterized by using sand as the mold material. It is relatively cheap and sufficiently refractory even for steel foundry use. A suitable bonding agent (usually clay)… …
54animal behaviour — Introduction any activity of an intact organism. A living animal behaves constantly in order to survive, and all animals must solve the same basic problems. They must, for instance, periodically replace their energy source (consume… …
55Current sea level rise — This article is about the current and future rise in sea level associated with global warming. For sea level changes in Earth s history, see Sea level#Changes through geologic time. Sea level measurements from 23 long tide gauge records in… …
56Ice age — An ice age is a period of long term reduction in the temperature of the Earth s surface and atmosphere, resulting in an expansion of continental ice sheets, polar ice sheets and alpine glaciers. Glaciologically, ice age is often used to mean a… …
57Chevrolet C/K — Manufacturer General Motors Also called GMC C/K GMC Sierra Production 1960–2000 United States 1965–2000 Canada 1964–2001 Br …
58Pleistocene Epoch — Earlier and longer of the two epochs that constitute the Quaternary Period. The Pleistocene began с 1.8 million years ago and ended с 10,000 years ago. It was preceded by the Pliocene Epoch of the Tertiary Period and followed by the Holocene… …
59animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by …
60Tin snips — are tools used to cut thin sheet metal. There are two broad categories: tinner snips, which are similar to common scissors, and compound leverage aviation snips, which use a compound leverage handle system. There are two major types of aviation… …
