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the world
Globally, the 20th century was marked by: (a) two devastating world wars; (b) the Great Depression of the 1930s; (c) the end of vast colonial empires.

en.wikipedia.org/wiki/Earth

Earth is the third planet from the Sun and the only object in the Universe known to harbor life. According to radiometric dating and other sources of evidence, ...

www.nasa.gov/audience/forstudents/5-8/features/nasa-knows/what-is-earth-58.html

Planet Earth has an abundance of water that makes it unique and perfect for life to exist.

nineplanets.org/earth.html

Earth is the third planet from the Sun and the fifth largest: Planet Profile. orbit: 149,600,000 km (1.00 AU) from Sun diameter: 12,756.3 km mass: 5.972e24 kg ...

www.ask.com/youtube?q=What+Is+The+Earth%3F&v=nt6ab7BTlgE
Aug 28, 2014 ... this channel exists for some reason that is actually numbers well MATH we aren't smart enough to figure it out... I haven't even learned to do ...

www.space.com/54-earth-history-composition-and-atmosphere.html

Dec 11, 2014 ... Earth is the only planet known to support life. Learn about Earth science facts and the planet's interior composition, surface and atmosphere.

www.ask.com/youtube?q=What+Is+The+Earth%3F&v=HGPv6vo5-l0
Oct 3, 2012 ... Science expert Emerald Robinson explains everything about planet Earth and its location in the solar system. To view over 15000 other how-to, ...

www.nationalgeographic.com/science/space/solar-system/earth

Earth, our home planet, is the only planet in its solar system known to harbor life. All of the things we need to survive are provided under a thin layer of ...

www.nationalgeographic.org/encyclopedia/earth

Aug 26, 2016 ... Earth is the planet we live on, the third of eight planets in our solar system and the only known place in the universe to support life.

en.oxforddictionaries.com/definition/earth

the planet on which we live; the world, the substance of ... Meaning, pronunciation, example sentences, and more from Oxford Dictionaries.