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Air Force air power airplane Alaska altitude America Arctic Circle Arctic Ocean Asia charts climate colder Columbus considered continental shelf deflected degrees distance earth's axis equator fact farther feet flight flying frozen global geography globe gnomonic projection great-circle Greek Greenland hemisphere high pressure area importance islands knowledge known Lambert land forms land power latitude less longitude low pressure area map projections measured Mediterranean Mercator Mercator chart meridians miles military moun mountains navigation North East north pole North West Passage northern ocean currents Pacific pack ice parallel plane polar equidistant pressure area prevailing winds produced rainfall reached regions result rhumb line ridges river routes Russia sailed sea power ship Siberia slopes snow sphere spherical earth Spitsbergen sq.mi stereographic summer surface tains temperature tion transportation ture United valleys warm weapon of opportu weather westerly winter