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Il y a 6 heures · A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. It is often referred to as a twister, whirlwind or cyclone, [1] although the word cyclone is used in meteorology to name a weather system with a low-pressure area in the ...
Il y a 6 heures · Ammonia is considered to be a weak base. It combines with acids to form ammonium salts; thus, with hydrochloric acid it forms ammonium chloride (sal ammoniac); with nitric acid, ammonium nitrate, etc. Perfectly dry ammonia gas will not combine with perfectly dry hydrogen chloride gas; moisture is necessary to bring about the reaction.
Il y a 6 heures · The wolf's head is large and heavy, with a wide forehead, strong jaws and a long, blunt muzzle. The skull is 230–280 mm (9–11 in) in length and 130–150 mm (5–6 in) in width. [37] The teeth are heavy and large, making them better suited to crushing bone than those of other canids, though they are not as specialized as those found in hyenas .
Il y a 6 heures · Tiger. The tiger ( Panthera tigris) is a member of the genus Panthera and the largest living cat species native to Asia. It has a powerful, muscular body with a large head and paws, a long tail and orange fur with black, mostly vertical stripes. It is traditionally classified into nine recent subspecies, though some recognise only two ...
Il y a 6 heures · The Sasanian Empire ( / səˈsɑːniən, səˈseɪniən /) or Sassanid Empire, also called the Second Persian Empire, and officially known as Eranshahr ("Kingdom of the Iranians"), [7] [8] [a] [10] was the last Iranian empire before the early Muslim conquests of the 7th to 8th centuries.
