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Question

Choose the non-periodic changes.
  1. Volcanic eruption
  2. Tornado
  3. Day and night cycle
  4. All of the above


Solution

The correct options are
A Volcanic eruption
B Tornado
Non-periodic changes are the changes that do not repeat themselves after a fixed interval of time. 
Example - Tornado, volcanic eruption, tsunami, etc. (most of the natural disasters)

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