Environmental Science
The Expansion of SPCA

Society for the Prohibition of Cruelty to Animals
Society for the Prevention of Cruelty to Animals
None
Society for the Protection of Common Animals

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

75% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere

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