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:a.
10% of the air molecules in the atmosphere.
b. 25% of the air molecules in the atmosphere.
c. 50% of the air molecules in the atmosphere.
d. 75% of the air molecules in the atmosphere.
c
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Fill in the blank(s) with the appropriate word(s).
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