What Mineral Particles Are the Dominant Colouring Agents in Reddish

question 39

Multiple Choice

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

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

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