Quran
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13- THUNDER AL R'AD Madinite /
Verse 17
17- He sends the rain-water from the floor of the vault of heaven and there it is conveyed along channels of various capacities in due measure. Where the torrent flows, it drives before it unworthy matter and impurities floating on the surface gathering into a heap of froth resembling aptly the foamy admixture and impurities mounting to the surface of the heated ores for the separation of precious metals used for ornaments and other uses. Thus does Allah give examples with allegorical representations of truth and falsehood. As to the froth and the scum, they are rejected and disappear, whereas what is profitable to the people remains behind on earth. Thus does Allah describe a subject under the guise of some other subject of aptly suggestive resemblance. Commentary: Without rain and the weathering of rocks there would de no soil for plants to grow in for mankind. Erosion is a mixed blessing. Much of the fine rock debris carried down from the highlands is developed in lower areas as a blanket of life-giving soil: the Nile Valley, the American Wheat, the Russian Ukraine etc. Depending upon the nature of the original sediments, the rainfall, the mineral content and the organic matter that builds up these earth deposits may range from barren dusts to the rich black soils. On the other hand erosion which has built the soils slowly carries some of them seaward to pile up in deltas or be sluiced away by flowing tides. Reference: Life Nature library
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