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Discussion

Olivine and pyroxene weather rapidly compared with quartz because their structures are

  • A.identical to quartz but finer grained
  • B.less strongly bonded and richer in iron and magnesium
  • C.more strongly bonded and entirely free of iron
  • D.framework silicates like quartz

Answer: B

Isolated tetrahedra and single chains held by cations offer far easier attack than a continuous framework, and the ferrous iron oxidises readily. A basalt therefore decays much faster than a granite in the same climate.

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