In their upper courses all the southern affluents of the Ghazal flow across a plateau of ferruginous laterite, their valleys having steep banks. [Please select]
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The surrounding country is formed of laterite rock which decomposes readily and forms a fine reddish silt in the tanks. [Please select]
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A similar appearance has been traced in a few instances to contamination of the coagulum in transit by the dust of the reddish rock (laterite) employed in localities for road-making. [Please select]
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