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www.reference.com/article/earth-43e8a25a6c575d7f

Earth formed around 4.54 billion years ago and is the third planet from the Sun. It is the fifth largest planet in the solar system and the largest of the terrestrial planets. It is also the densest of all the planets.

www.reference.com/article/earth-day-358a56b28a71a70c

Gaylord Nelson founded Earth Day. It was renamed officially by the U.N. in 2009 as International Mother Earth Day, and some schools and communities celebrate the day for an entire week. Also, the first Earth Day was celebrated on April 22, 1970.

www.reference.com/slideshow/facts-show-little-house-on-the-prairie

From 1974 to 1983, fans tuned in every week to watch what happened next to the Ingalls family on Little House on the Prairie. Based on Laura Ingalls Wilder’s bestselling children’s books, the television series inspired viewers with heartwarming, dramatic tales of famili...

www.reference.com/article/earth-kids-e596841acd115d0e

Earth is the only planet that has liquid water on its surface, it is 93 million miles from the sun, and the Atlantic Ocean is the saltiest of the oceans. Earth is a unique planet in the solar system.

www.reference.com/slideshow/unbelievable-abandoned-places

Some abandoned places will scare the living daylights out of you, while other deserted sites will take your breath away. Either way, you might be tempted to explore these must-see destinations yourself.From floating forests and restricted cities to a scary doll island, ...

www.reference.com/article/interesting-earth-c03cd3346a85cdd2

One interesting fact about Earth is its status as the fifth planet in terms of size but the densest of all. It also ranks as the largest of the terrestrial planets in the solar system and the only one on which water exists in liquid form on its surface.

www.reference.com/slideshow/old-animals

The average human lifespan is around 79 years, though some members of our species have celebrated their 100th—and even 122nd—birthdays. But while these triple-digit lifespans are anomalies for us, some animals are so over-the-hill that hitting ten decades is the norm.Fr...