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What Mineral Particles Are the Dominant Colouring Agents in Reddish

Question 28

Multiple Choice

What mineral particles are the dominant colouring agents in reddish, brownish, and yellowish soils?


A) soluble potassium and sodium bicarbonates
B) humus and calcium carbonate
C) very fine-sized silica and calcite particles
D) dust-sized grains of iron oxides

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