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We have seasons because the Earth rotates around its axis and revolves around the sun. Every now and then, a part of the Earth is tilted towards the sun while the other parts are not, this caused the changes of the seasons. As it continue to revolve around the sun, we will always have a change in the season.
Seasons are due to the tilting of earths axis and the revolution of the earth around the sun that brings northern or southern hemisphere closer to the sun at different times of the year