Why do we have seasons? its about tilt and revolution. use the diagram to label the four seasons on earth in the northern hemisphere.

-summer
-fall
-spring
-winter

The correct matches are:

Summer - C

Fall - D

Spring - B

Winter - A

The season on the Earth in the mid latitudes are directly dependent on the Earth's revolution and its tilting. Specifically for the Northern Hemisphere, when the Northern Hemisphere is tilted towards the Sun than it is summer on it because it gets more solar radiation. As the Earth continues its revolution it starts to tilt away the Northern Hemisphere, resulting in a drop in temperature, thus having autumn. When the Earth reaches a point where the Northern Hemisphere is tilted away from the Sun than it is winter because it receives less solar radiation. After that point, the Earth starts to slowly tilt the Northern Hemisphere towards the Sun again, thus having spring.