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Mapping a phenomenon that exists only at certain points, such as earthquake epicentres, is best done with

  • A.shading applied across whole districts
  • B.isolines interpolated over the region
  • C.a cartogram scaled by area of damage
  • D.point symbols placed at each occurrence

Answer: D

The data are genuinely discrete, so a display that spreads them across an area would imply a continuity that does not exist. Density surfaces may be derived from the points afterwards, but the points remain the observation.

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