Environmental Science
Euro II standard refers to _________

Lowering sulfur content in fuel
Lowering carbon content in fuel
Increasing sulfur content in fuel
increasing carbon content in fuel

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Environmental Science
If a glass of water were surrounded by saturated air:

The level of the water in the glass would slowly decrease
The water's temperature would slowly decrease
The water's temperature would slowly increase
The level of the water in the glass would not change

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

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