The Earth



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planet population:

1 billion in 1820
2 billion in 1930
3 billion in 1960
4 billion in 1974
5 billion in 1988
6 billion in 2000


70% of the world's surface is water
29% is land


The Earth is the third planet from the Sun and the fifth largest


orbit: 149,600,000 km (1.00 AU) from Sun
diameter: 12,756.3 km
mass: 5.972e24 kg


Nitrogen makes up about 78% of the atmosphere by volume.
I ts compounds are vital components of foods, fertilizers, and explosives. Nitrogen gas is colourless, odourless, and generally inert. As a liquid it is also colourless and odourless.