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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/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/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/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-number-10-7375ceb63c1bf69f

Some interesting facts about the number 10 include the Korean alphabet has 10 vowels, Virginia was the 10th state to enter the Union and the metric system is based on the number 10. In England, a person can be convicted of a criminal offense at the age of 10 and can rec...

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...

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.