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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/can-learn-earth-science-934de3970345e3a4

Some ways to learn about earth science are to attend a college program that teaches the subject or visit earth science websites, such as the one hosted by the American Geosciences Institute. The top school in the US for Earth Science, as of 2014, is the California Insti...

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/careers-earth-science-1b67c326a4ac4ba0

Depending on the focus of study, careers in Earth Science can include paleontology, seismology, meteorology, oceanography and space science. Nearly any career that focuses on the Earth, its functions or the environment in which it exists falls into the realm of Earth Sc...

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/can-study-earth-science-online-623ae8df640f73ad

People can study earth science online through Study.com, Academic Earth and MIT Open Courseware. These courses are open to anyone and cover a variety of topics within the earth science category.