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A bivariate thematic map is one that

  • A.is drawn at two different scales at once
  • B.shows two variables on a single map
  • C.uses exactly two colours in its legend
  • D.covers two entirely separate study areas

Answer: B

Two variables are encoded together, often as a grid of nine colours combining two three-class schemes. The technique reveals where the two coincide, at the cost of a legend the reader must study before the map can be read.

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