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Methods of Representation of Relief on the Map > Contours

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CISCE: Class 10

Key Points: Methods of Representation of Relief on the Map > Contours

  • Contours are imaginary lines joining places of the same height above mean sea level (MSL) and show height, slope, and relief.
  • Contour interval is the vertical distance between two consecutive contours; in ICSE topographical maps it is 20 metres.
  • Index contours are every fifth contour line and are thicker and numbered, while intermediate contours are not numbered.
  • Contours are continuous lines that never break or intersect, though they may merge in case of steep slopes or cliffs.
  • Spacing and shape of contours help identify slopes and features: close lines show steep slopes, wide lines show gentle slopes, and V-shaped contours indicate river valleys.
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