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Which consequence results when high pressure narrows a silicate's *band gap*?

A)Increased electrical conductivity
B)Increased thermal expansion
C)Decreased optical transparency
D)Decreased mechanical hardness

💡 Explanation

Increased pressure causes *band gap narrowing*, shifting absorption to lower energies; consequently, increased photon absorption arises because a smaller energy input activates electrons, therefore optical transparency reduces, rather than other mechanical changes.

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