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Earth & Natural Systems

What happens to cation exchange capacity (CEC) in soil when silicate minerals weather and release silicon?

A)CEC decreases due to decreased pH
B)CEC remains stable because silicon is inert
C)CEC increases due to increased surface area
D)CEC fluctuates randomly due to redox reactions

💡 Explanation

As silicate minerals weather, they break down into smaller particles, increasing the surface area available for cation adsorption; because CEC is directly related to surface area, it increases. Therefore, increased surface area enhances cation retention, rather than remaining stable or fluctuating randomly.

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