Google Doodle Honors Earth Day 2013, Watch Interactive Doodle

In honor of Earth Day 2013, Google rolled out a new doodle which pictures scenic shots of a mountain and a lake that's home to a school of fish.

Google has been creating doodles for environmental awareness for 13 years now, with a melting polar ice in 2007 (a prophetic nod to the record Arctic melt that year), rocks in 2008, a waterfall and marine life in 2009 to parrots in 2010, pandas in 2011 and animated flowers in 2012.

Earth Day is held every year on 22 April to highlight environmental issues, with events held around the world to show support. More than one billion people across 192 countries now participate in activities, with planting trees being one of the most popular ways to show support.

This years Google doodle has several features, click around and you'll see more. Things included are fireflies, a bear emerging out of a cave, a -- what is that? a badger? -- as well as ants, and dandelions you can "blow out." The passing of the seasons provides a backdrop, all under the watchful, alternating eyes of the sun and the moon.

Google also posted this handy, dandy "sightseeing checklist" so you don't miss a single element of what is considered one of the most ambitious Google Doodles yet.

US senator Gaylord Nelson conceived the idea for the event in the wake of the 1969 oil spill in Santa Barbara, California. The first Earth Day began in 1970 when 20 million Americans took to the streets to demand a sustainable environment and it is widely credited with launching the modern environmental movement.