The acute angle between the cord line of the wing and the direction of the relative wind is the angle of attack
Platinum is found in its pure native form, or in platiniridium, a natural alloy of platinum and iridium. Platinum is present in thin sulfide layers in certain maficigneous bodies and is mined in Canada, Russia, South Africa, the USA, Zimbabwe and Australia. Some platinum is obtained as a by-product of copper and nickel processing.
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Intervening Obstacle: An intervening obstacle is an environmental or cultural feature that hinders migration. Chain migration: Further migration to a place where friends or relatives have already settled.
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