51.
Comparing quartzite with limestone as a foundation rock, quartzite is preferable because it is
Answer: C
Correct answer: insoluble as well as strong
Quartzite is very strong and, being almost pure quartz, chemically inert and insoluble, so it offers neither the solution cavities nor the leakage paths that make limestone so treacherous a foundation. Both rocks are strong when intact; it is the solubility of the carbonate, and the karst that follows from it, that separates them.
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