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Facts About Earth

Jul 16, 2020

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Science

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Earth is unique among the known planets: it has an abundance of water. Other worlds

— including a few moons — have atmospheres, ice, and even oceans, but only Earth

has the right combination to sustain life.


Earth's oceans cover about 70 percent of the planet's surface with an average depth of

2.5 miles (4 kilometers). Fresh water exists in liquid form in lakes and rivers and as

water vapor in the atmosphere, which causes much of Earth's weather.


Earth has multiple layers. The ocean basins and the continents compose the crust, the

outermost layer. Earth's crust is between three and 46 miles (five and 75 km) deep.

The thickest parts are under the continents and the thinnest parts are under the

oceans.

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Alien worlds may be all the rage, with their mystique and promise, but the orb we call home, planet Earth, has all the makings for a jaw-dropping blockbuster movie: from the drama of explosive volcanoes, past meteor crashes and catastrophic collisions between rocky plates to the seeming fantasy of the ocean's deep abysses swirling with odd life and tales of the coldest, hottest, deepest, highest and all-out extreme spots. Did you know Earth is not actually a sphere? That we are rocketing around the sun at 67,000 mph? That the majority of Earth's fresh water is locked up in Antarctica?