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Generally speaking:
71% of the Earth surface is covered with salt-water oceans or seas.
Earth's atmosphere contains 21% of oxygen.
Earth is third planet from the Sun in the Solar System. Solar System consists of 8 Planets; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. In 2006 Pluto was excluded from the list of planets.
Milky Way is the home Galaxy of the Solar System.
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