Environmental Science
Euro II standard refers to _________

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

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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:

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

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Environmental Science
Assuming that the night will remain clear, calm, and unsaturated, the predicted minimum temperature is 32oF. Suddenly the wind speed increases and remains gusty throughout the night. The minimum temperature will most likely be:

Higher than predicted due to the release of latent heat
Much lower than predicted due to radiational cooling
About the same as predicted but will occur earlier in the night
Higher than predicted due to mixing

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