Answer:
the earth and the sun are best friends, and the earth is always around the sun. however, when the earth goes to sleep, it faces away from the sun. this is why it is so dark at night. in the morning, it rolls over and faces the sun. this is why it is light during the day. the earth gets warmer and colder depending on whether it is facing the sun. so, sometimes with it's facing the sun halfway, it's chilly but not too cold. this is fall. when it's all the way faced away from the sun, it's really cold. this is winter. when it's super close to the sun, it's warm. this is summer. and in the time when it's close to being in summer, it's halfway there, that's spring.
