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Text File  |  1992-09-02  |  239b  |  7 lines
  1. Valley formed by the subsidence of a block of
  2. the Earth's crust between two or more
  3. parallel faults. Rift valleys are steep-sided
  4. and form where the crust is being pulled
  5. apart, as at ocean ridges, or in the Great
  6. Rift Valley of E Africa.
  7.