wash drilling
51Океан — I Океан в древне греческой мифологии один из богов титанов (См. Титаны), обладавший властью над мировым потоком, окружавшим, по представлениям греков, земную твердь; сын Урана и Геи (См. Гея). В борьбе Зевса и др. богов олимпийцев с… …
52Autonomous building — An autonomous building is a building designed to be operated independently from infrastructural support services such as the electric power grid, municipal water systems, sewage treatment systems, storm drains, communication services, and in some …
53Chromium — This article is about the chemical element. For other uses, see Chromium (disambiguation). vanadium ← chromium → manganese ↑ Cr ↓ Mo …
54Cretaceous–Tertiary extinction event — Artist s rendering of bolide impact Badlands nea …
55Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …
56History of science — History of science …
57Orca — Taxobox name = Orca status = LR/cd | status system = IUCN2.3 status ref = image caption = Transient Orcas near Unimak Island, eastern Aleutian Islands, Alaska image width = 250px image2 caption = Size comparison against an average human regnum =… …
58Risk — takers redirects here. For the Canadian television program, see Risk Takers. For other uses, see Risk (disambiguation). Risk is the potential that a chosen action or activity (including the choice of inaction) will lead to a loss (an undesirable… …
59Geography of Russia — The Russian Federation stretches across much of the north of the super continent of Eurasia. Because of its size, Russia displays both monotony and diversity. As with its topography, its climates, vegetation, and soils span vast distances.cite… …
60Starch — Starch, CAS# 9005 25 8, chemical formula (C6H10O5)n is a polysaccharide carbohydrate consisting of a large number of glucose monosaccharide units joined together by glycosidic bonds. All plant seeds and tubers contain starch which is… …
