File:Intrusions air mountains nasa.jpg

Intrusions_air_mountains_nasa.jpg(400 × 372 pixels, dimenjiun dl file: 95 KB, MIME type: image/jpeg)

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English: In Africa, Precambrian mountains often stand out in stark relief as topographic highs midst lowlands covered by sand. Such mountains are found in parts of the Sahara Desert. Here are the Aïr Mountains in Niger, consisting of peralkaline granite intrusions which appear dark (unusual since most granitic masses are light-toned in the field).
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Autur NASA / Landsat

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Public domain Questo file è nel pubblico dominio perché creato dalla NASA. La politica sul copyright della NASA afferma che «il materiale della NASA non è protetto da copyright a meno che non sia specificato altrimenti». (NASA copyright policy e JPL Image Use Policy).
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atuel21:02, 27 mei 2008Miniatura de la version de la 21:02, 27 mei 2008400 × 372 (95 KB)T L Miles{{Information |Description=In Africa, Precambrian mountains often stand out in stark relief as topographic highs midst lowlands covered by sand. Such mountains are found in parts of the Sahara Desert. Here are the Air Mountains in Niger, consisting of per

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