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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. More »

www.reference.com Science Astronomy Planets

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 exis... More »

www.reference.com Science Earth Science

One interesting Earth fact that kids should know is that Earth is the only planet with an atmosphere that contains 21 percent oxygen. It is also the only planet known to contain life. The Earth is the third planet from t... More »

www.reference.com Science Earth Science
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Earth formed around 4.6 billion years ago by collisions in a giant disc-shaped cloud of material. Gravity caused this gas and dust to slowly accrete into clumps ,which became the asteroids and small early planets called ... More »

www.reference.com Science Astronomy Planets

As the only known planet that is habitable for human beings, the Earth’s importance is self-evident. Every living organism known to science obtains all of its resources from Earth, and has very few other options availabl... More »

www.reference.com Science Astronomy Planets

The eight described planets all orbit the Sun at different distances; Mercury is the closest planet to the sun, followed by Venus, then Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The distances of the planets are n... More »

www.reference.com Science Astronomy Planets

Beginning with the planet closest to the Sun and moving outward, the order of the planets is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Before its reclassification as a dwarf planet by the Internat... More »

www.reference.com Science Astronomy Planets