Contour Lines

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Across
  1. 2. Line joining points of the same height
  2. 4. closely spaced lines
  3. 6. short lines perpendicular to contour lines
  4. 7. height between successive contours
Down
  1. 1. widely spaced lines
  2. 3. only method that produces true contours
  3. 5. Point where exact location is known