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A residual soil differs from a transported soil in having

  • A.been carried from elsewhere by an agent
  • B.no clay content whatever
  • C.no relation to any parent rock
  • D.formed in place from the rock beneath it

Answer: D

Correct answer: formed in place from the rock beneath it

A residual soil is the weathered product of the rock directly beneath it, so its character can be anticipated from that rock and it grades downward into it through the weathering profile. A transported soil has been carried from elsewhere by water, wind or ice and bears no relation to what lies below. The distinction matters in site investigation, since a residual profile can be predicted and a transported one cannot.

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