How do the global trends in air pollution differ from those in the United States?
What will be an ideal response?
The United States has been able to reign in air pollution with the help of the Clean Air Act, despite an increase in products produced by coal-powered plants. Great international improvements in air quality have not been measured, though. The biggest problem is that coordinated international efforts are difficult to achieve.
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Refraction causes a fish in water to appear
A. nearer the surface. B. deeper. C. neither deeper nor closer. D. none of the above
The volcanic explosivity index (VEI) can be correlated with the number of deaths caused by an
eruption.c Indicate whether the statement is true or false.
The process of photosynthesis converts sunlight energy into ________.
A. plant biomass and water. B. oxygen and plant biomass. C. water and oxygen. D. None of the options is correct.
The high temperatures in the thermosphere occur because
A) high intensity solar radiation causes strong chemical reactions with ozone, and this heats the layer to very high temperatures. B) carbon dioxide has accumulated to very high levels in this layer. C) infrared radiation from the ground heats this layer more than any other layer. D) it is in direct contact with high energy solar radiation. E) methane is such an effective greenhouse gas.