how was it formed?
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what are the nine planets in the solar system Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. what features does the third one have? It is the third planet from the Sun and the only astronomical object known to harbor life.
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Earth [SEP] Introduction
Earth is the third planet from the Sun and the only astronomical object known to harbor life. About 29% of Earth's surface is land consisting of continents and islands. The remaining 71% is covered with water, mostly by oceans but also lakes, rivers and other fresh water, which together constitute the hydrosphere. The majority of Earth's polar regions are covered in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's outer layer is divided into several rigid tectonic plates that migrate across the surface over many millions of years. Earth's interior remains active with a solid iron inner core, a liquid outer core that generates Earth's magnetic field, and a convecting mantle that drives plate tectonics.