Aluminium metal is not found as the free element, however, aluminium is an abundant element in the earth's crust. The most important ore is bauxite. Abundances for aluminium in a number of different environments.
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What is Ground Effect? The principle of Wing-in-ground-effect or (W.I.G) has been known for a long time. Ground effect is a natural phenomenon, as an aerofoil approaches the ground its lifting ability increases and the drag reduces. The lift to drag ratio increases as the pattern of circulation around the wing changes. This pattern of air around the wing causes a cushion on the underside to develop.