(RNN) – Fish swim, flowers grow, birds zip around and ants crawl in their tunnels.
Google captured the spirit of Earth Day in an animated doodle that not only cycles through day and night but through the four seasons of the year and the phases of the moon.
The animation takes a few minutes to cycle through. While the sun and moon slowly rise and set, a school of fish swim laps in a pond that makes up the small G in Google's name.
A river flows into and out of the pond through mountains representing the two Os and looping to make the E before the water drips off the edge of the doodle, except in winter when it is frozen. Flowers bloom in the spring to make the larger G.
Earth Day was first celebrated in 1970 and is considered the birth of the environmental movement. The first Earth Day helped lead to the formation of the Environmental Protection Agency and passage of the Clean Air, Clean Water and Endangered Species acts.
Nearly 200 countries recognize Earth Day.
If you think you know about the environment, take this quiz at CNN.com and see how well you do.
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