Environmental Science
What is the cause of the Exxon Valdez?

a ship which wrecked on the coast of India
a plane which crashed and caused death of human life
none of these.
Oil Tanker which sank in 1989 along the coast of Alaska and marine life seriously affected.

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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:

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

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