Class VIII

Sedimentary layers over a period of time are compacted and cemented to form
  1. sedimentary rocks
  2. mountains
  3. deserts
  4. hills
Hazard of mountain climbing is
  1. weathering
  2. snow fall
  3. rock falls
  4. erosion
Repetition in expansion and contractions in rocks give rise to
  1. stress
  2. heat
  3. volume
  4. force
In deserts there is existence of extreme in day and night
  1. temperatures
  2. erosion
  3. pressure
  4. cycles
Water expands on
  1. room temperature
  2. boiling
  3. freezing
  4. flowing
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