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Discussion

Basalt is a satisfactory aggregate but may present the difficulty of

  • A.a hardness too low for use as aggregate
  • B.columnar jointing and vesicular zones
  • C.solubility in circulating water
  • D.swelling clay content in every case

Answer: B

Cooling contraction produces regular columns, and gas cavities give vesicular horizons of low strength, while some flows carry weathered clay-rich zones between them. Sound basalt is nonetheless a strong and durable rock.

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