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Arrange the 'slope segments' from lower to higher level :

(1) Waxing slope
(2) Constant slope
(3) Free face
(4) Wanning slope

  • A.(4), (2), (3), (1)
  • B.(2), (3), (4), (1)
  • C.(4), (3), (2), (1)
  • D.(4), (2), (1), (3)

Answer: A

From lower to higher, the order is (4), (2), (3), (1).

The standard hillslope profile (Wood 1942, adopted by L.C. King) has four elements from the crest down: the convex waxing slope at the top, the steep rock free face, the constant slope of debris below it, and the concave waning slope at the foot. Reading upward from the base gives waning, constant, free face, waxing.

The other codes misplace the free face above the waxing slope, start from the constant slope, or put the free face below the constant slope.

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