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Sampling from a falling stream is preferred to sampling from a stationary heap because

  • A.very much less material is needed for the sample itself
  • B.it avoids any need for a riffle splitter afterwards
  • C.the whole stream can be cut at intervals across its full width
  • D.the material happens to be a good deal drier in a falling stream

Answer: C

Cutting the entire cross-section for a short time gives every particle the same chance of entering the sample, which is the definition of a correct increment. A heap has already segregated before any spoon is put into it.

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