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Earth is the largest, most massive, and densest of the Solar System’s four terrestrial planets. It is sometimes referred to as the World. Home to millions of species, including humans, Earth is the only place in the Universe where life is known to exist.

Earth’s outer surface is divided into several tectonic plates, that gradually migrate across the surface over periods of many millions of years. About 71% of the surface is covered with salt-water oceans, the remainder consisting of continents and islands; liquid water, necessary for all known life, is not known to exist on any other planet’s surface. Earth’s interior remains active, with a thick layer of relatively solid mantle, a liquid outer core that generates a magnetic field, and a solid iron inner core.

Earth’s only known natural satellite, the Moon, provides ocean tides, stabilizes the axial tilt and gradually slows the planet’s rotation.

Diameter: 7,926 miles

Period of Time: 24 hours

Distance from Sun
Minimum: 91 million miles
Maximum: 94.5 million miles

Bonus Video


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