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A dyke differs from a sill in being

  • A.discordant, cutting across the bedding
  • B.concordant, lying parallel to the bedding
  • C.always thicker than a sill
  • D.always formed at greater depth

Answer: A

A dyke fills a fracture and so crosses the strata, while a sill is injected along them. The distinction matters to a tunnel or a foundation because a dyke may be met unexpectedly and is often weathered along its margins.

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