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Why do we have seasons?
The changes in seasons occur because of the tilt of the earths axis is always the same as it circles the sun. When the earth is on one side of the Sun, the Nothern Hemispere (half of the world) is tilted towards the Sun. It is then summer in the north of the world and winter in the south.
As the earth moves a quarter way round the sun the northern half starts to tip away. This brings cooler autumn weather to the south and warmer spring weather to the north This keeps going all year round.
Seasons are periods of similar weather thatn occur at certain times of the year. Outside the tropics there are four seasons each year. Each one lasts about three months.
