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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/amazing-animal-6a35e0ba8996d4ae

The entire lifespan of a house fly is 14 days, and they only buzz in the key of F. Ostriches are even faster than horses.

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/article/amazing-spiders-b3915137f52b1c78

As of 2015, there are about 40,000 known species of spiders worldwide, and they live in almost every habitat in every continent except Antarctica. Despite this diversity, all spiders share some of the same common traits, such as having eight legs and two body parts (the...

www.reference.com/article/amazing-sharks-9eb95f7f421f6f5a

An amazing fact about sharks is that the skins of females are much thicker than that of males. This is because male sharks tend to bite the females during mating. In its lifetime, a shark can go through about 30,000 teeth.

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/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.