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A contiguous cartogram differs from a non-contiguous one in that it

  • A.preserves the true shape of every unit
  • B.keeps the units joined to their neighbours
  • C.scales the units by area rather than by value
  • D.uses only circles to stand for the units

Answer: B

Correct answer: keeps the units joined to their neighbours

Both types resize the units by the mapped value; the difference is what is sacrificed to do it. A contiguous cartogram keeps the units joined and distorts their shapes to make the areas fit, so the map remains a connected whole but individual outlines become unrecognisable. A non-contiguous one keeps each shape true and lets the units float apart, so the topology is lost instead.

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