Allah says
(An-Nahl 81) And He made for you from the mountains: cavities
Kinana: a small quiver of leather or the like; to put arrows
The land of the Kinana: metaphorically referred to as the land of Egypt
We take from the verse
God knows what he means by this verse, but God Almighty tells us that the mountains are not smooth, but have cavities, Perhaps it has a specific function, for God never created anything in vain - glory be to Him -
And read this scientific talk
Weathering pits as indicators of relative age of granite surfaces in the Cairngorm Mountains, Scotland Weathering pits 1-140 cm deep occur on the Vikerngorms granite surfaces associated with a range of landforms, including inflections, and ice-prone slabs, large faults, and block fields. Crater depth is positively correlated with age of cosmos exposure, and both scales show consistent relationships on individual rock morphologies. Pit deepening rates are non-linear and the best fit is provided, By the sigmoid function D = b1 + exp (b2 + b3 / t). The deepest craters occur in unmodified peaks, where exposure ages of 10Be indicate that the surfaces were weathered for at least 52–297 kPa. Surfaces gave, exposed to ice with excavation depth of 10-46 cm, exposure intervals of 10 bp 21–79 kPa, indicating exposure to glacial erosion prior to the glacial cycle Last. the combination of exposure ages of the cosmos with weathering crater depths extends it exponentially To the area in which inferences can be made regarding the ages of granite surfaces in cairngorms. well-developed weathering craters are seen on the exposed surfaces of ice in the regions Other granites are possible indicators of glacial erosion before the last Ice Age maximum.
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