You might have observed that the seasons change as a year
progresses. You might have felt the heat of the summer and the chill in the
winter. What causes these seasonal changes?
The Earth takes about one
year to revolve around the Sun, and also it rotates on its axis. The axis on
which the Earth rotates is slightly tilted, and this causes the cycle of
seasons. While the Earth is revolving, if the Northern Hemisphere gets the
direct sunlight, it has summer and on the other side, the Southern Hemisphere,
will have winter. When the Southern Hemisphere faces direct sunlight it will
have summer and it will be winter in the Northern Hemisphere.