A. Epson salt
B. Limestone
C. Clay
D. Urea
Correct Answer:
Option C – Clay
Explanation
Between the five main minerals found in clay, kaolinite is the most common. Kaolinite holds the chemical composition Al2Si2O5(OH)4 and is an aluminum silicate material with a low “shrink-swell” capacity. It is a soft, white mineral but is often colored orange or red by iron oxide found in the soil.
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