As autumn arrives, the Northern Hemisphere tilts farther and farther away from the sun – a shortening of the day's light that curbs photosynthesis and produces the brilliant yellows and reds of aspen trees in the Mountain West.
1923 Hits
As autumn arrives, the Northern Hemisphere tilts farther and farther away from the sun – a shortening of the day's light that curbs photosynthesis and produces the brilliant yellows and reds of aspen trees in the Mountain West.