Air Massif

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Air Massif

The Air Massif, or Air Mountains, are oases of greenery in the middle of the Sahra Desert in Niger.

All of the mountains together extend over 84,000 km2 (32,000 sq mi), with an average height between 500 and 900 m (1,600 and 3,000 ft).

 

Questions: 

What causes the greenery in the middle of the desert?

What could have formed these raised platforms?