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Comparing a residual with a transported soil for foundation purposes, the residual soil

  • A.contains no clay minerals
  • B.can be anticipated from the rock beneath it
  • C.bears no relation to the underlying rock
  • D.is always stronger than a transported soil

Answer: B

Correct answer: can be anticipated from the rock beneath it

A residual soil is the decomposition product of the rock below, so knowing that rock allows its character to be predicted - a granite gives a clayey sand, a basalt a heavy clay - and the profile grades continuously into fresh rock. A transported soil has no such relation to what lies beneath and must be investigated on its own. Residual soils certainly contain clay, and are not automatically stronger.

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