1950 in aviation
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Chimborazo
Unconformity
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National Geographic Bee
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Aimé Bonpland
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Cotopaxi
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Edward Whymper
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Seven Summits
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Earth radius
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Equatorial bulge
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Popocatépetl
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Alexander von Humboldt
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Mount Everest
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Mountain
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Mountaineering
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Hollow Earth
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Ecuador
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Geography of Ecuador
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Earth
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August 15
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Andes
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