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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/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/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-day-2eb15d8fde2e967

Earth Day began in the late 1960s following the Vietnam War and was originally created with political aims. The Earth Day holiday on April 22 actually follows the first Earth Day of the year on March 20, the spring equinox.

www.reference.com/article/four-interesting-planet-earth-1fb4ded0d7212fbe

Earth is the only planet in the solar system not named after a Roman or Greek deity. The hottest recorded temperature is 136 degrees Fahrenheit. Scientists believe that Earth once had two moons. The longest mountain range on the planet is underwater and is called the mi...

www.reference.com/article/interesting-earth-s-crust-db02daebc369b7b2

Earth's crust is both the outermost and the thinnest of the planet's layers, is composed mostly of oxygen and silicon, and is where the most ancient rock samples in the world have been found. Overall our planet's crust ranges from 3 to 44 miles in thickness, extending t...