Spring, summer, winter, fall. Learn why the seasons really come and go in this BrainPOP movie! In it, Tim and Moby will show you how the tilt of the earth and its orbit around the sun affect the changing weather. You’ll see why the Northern Hemisphere and Southern Hemisphere have opposite seasons, and why tropical areas stay warm year-round. Find out what makes the seasons change so rapidly at the North and South Poles. Plus, Tim will explain the significance of the summer and winter solstices and the vernal and autumnal equinoxes. Hint: They’re not connected to the behavior of small, ground-dwelling rodents!