Surface area :510,072,000 km² 148,940,000 km² land (29.2 %) 361,132,000 km² water (70.8 %)
Mass :5.9736×1024 kg
Atmosphere Composition:
78.08% Nitrogen (N2) 20.95% Oxygen (O2) 0.93% Argon 0.038% Carbon dioxide About 1% water vapor (varies with climate)
Earth has approximately 6,671,226,000 human inhabitants as of July 2007. Projections indicate that the world's human population will reach seven billion in 2013 and 9.2 billion in 2050. Most of the growth is expected to take place in developing nations. Human population density varies widely around the world, but a majority live in Asia. By 2020, 60% of the world's population is expected to be living in urban, rather than rural, areas.
1 comments:
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