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What causes the earth to experience different seasons?

Have you ever wondered why the earth experiences Fall, Winter, Spring, and Summer? Generally, the Northern Hemisphere will experience different climate conditions than the Southern Hemisphere. For instance, one hemisphere will experience the cold conditions of winter while the other hemisphere experiences the warmer conditions of summer. This is illustrated in the picture at left which shows the Northern Hemisphere countries of the U.S., Canada, and Mexico experiencing the warm conditions of summer while the Southern Hemisphere experiences the cooler conditions of winter. The image on the right shows the reverse: the Northern Hemisphere is experiencing Winter while the Southern Hemisphere experiences Summer.

Did you know that our four seasons exist because of the tilt of the earth on its axis and because of the earth's orbit around the sun? The manner in which this factor produces our seasons is very easy to explain. Take a few moments to think about how this may occur.