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B) The rotation of the Earth around the sun





          Earth rotates around the Sun once every 365   days
                                                                                            (a year).


          This rotation causes the sequence of the four seasons.


          The four seasons are (summer – autumn - spring - winter).







                   In summer season, day is longer than night.


                   In winter season, day is shorter than day.



                   In spring or autumn hours of day is equal to hours of night









































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