When plates of continental crust collide, mountain ranges such as the Himalaya are pushed toward the skies.Earth's atmosphere is 78 percent nitrogen, 21 percent oxygen, and one percent other gases such as carbon dioxide, water vapor, and argon.

© Beyond the outer core lies the mantle, a 1,800-mile-thick layer of viscous molten rock on which Earth's outermost layer, the crust, rests. In the spring and fall, each hemisphere receives similar amounts of light.

Earth happens to lie within the so-called "Goldilocks zone" around the sun, where temperatures are just right to maintain liquid water on our planet's surface. Earth is the third planet from the Sun and the only astronomical object known to harbor life.According to radiometric dating estimation and other evidence, Earth formed over 4.5 billion years ago.

Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime.The concept of space is considered to be of fundamental importance to an understanding … Scientists see these features not just from the ground, but also in images taken from space – a process called remote sensing. But unlike its rocky siblings, almost 70 percent of Earth's surface is covered in oceans of liquid water that average 2.5 miles deep.

Scientists have yet to precisely nail down exactly how our primitive ancestors first showed up on Earth.
Sunlight heats the planet's surface, causing warm air to rise into the troposphere.



© 1996-2015 National Geographic Society, © 2015- Please deactivate your ad blocker in order to see our subscription offerThe image of Earth in space like a blue marble highlighted the planets fragility and the beauty of Earth. This teardrop-shaped field shields Earth from high-energy particles launched at us from the sun and elsewhere in the cosmos.







Our planet has one moon, while Mercury and Venus have none and all … 2020 National Geographic Partners, LLC. The Earth Observing Dashboard, unveiled on Thursday, June 25, is the result of a joint effort by three of the world’s major space agencies, namely NASA, ESA (Europe), and JAXA (Japan).

This means the Northern and Southern hemispheres will sometimes point toward or away from the sun depending on the time of year, and this changes the amount of light the hemispheres receive, resulting in the Earth's orbit is not a perfect circle, but rather an oval-shaped ellipse, similar to the orbits of all the other planets. Every other solar system planet was named for a Greek or Roman deity, but for at least a thousand years, some cultures have described our world using the Germanic word “earth,” which means simply “the ground.”Earth orbits the sun once every 365.25 days.
But for all that our atmosphere does, it's surprisingly thin.

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