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A diverging colour scheme is the right choice when the map shows

  • A.a set of land-use categories of equal rank
  • B.the route followed by a single journey
  • C.change measured either side of a zero point
  • D.a rate that rises steadily from low to high

Answer: C

Two hues darkening away from a pale centre let the reader see both the direction and the size of the departure from the midpoint. Using such a scheme for data with no meaningful middle invents a division that is not there.

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