The next time you snag a window seat on an airline flight, check out the planeâs wing. There is a good chance the tip of the wing will be angled upward, almost perpendicular. Or it might bend smoothly up like the tip of an eagleâs wing in flight. Though obviously more complex, these wing modifications have the same aerodynamic function as the folded wingtips of a paper airplane.
scoria - the scum formed by oxidation at the surface of molten metals. slag, dross. scum - a film of impurities or vegetation that can form on the surface of a liquid. basic slag - slag produced in making steel; low in silica but having large amounts of calcium phosphate; useful as fertilizer.
psoriasis is a common skin condition that changes the life cycle of skin cells psoriasis causes cells to build up rapidly on the surface of the skin the extra skin cells form thick silvery scales and itchy dry red patches that are sometimes painful