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| The layer of air closest to the Earth, the layer we live in, is the ____________________. |
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| The major legislation that dictates federal air pollution policy is the ____________________ ____________________ ____________________. |
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| ____________________ in the stratosphere absorbs ultraviolet radiation. |
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| The ozone hole occurs in the layer of the atmosphere known as the ____________________. |
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| As early multicellular organisms evolved, they released more ____ into the atmosphere. |
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| The most abundant constituent of our atmosphere is ____. |
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| A/An ____ is used to measure air pressure. |
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| The largest source of air pollutants in the United States is/are ____. |
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| ____ is the release of volatiles from Earth's mantle in volcanic eruptions. |
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| During photosynthesis, plants convert ____ and ____ to organic sugars and oxygen. |
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| Solar energy breaks oxygen molecules apart in the stratosphere, releasing ____, which combine(s) with additional oxygen molecules to form ____. |
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| becomes less dense with increases altitude |
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| The highest portion of the atmosphere that absorbs high-energy radiation is the: |
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| Which of the following orders of the layers of the atmosphere is correct? (Start with the lowest layer.) |
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| troposphere < stratosphere < mesosphere < thermosphere |
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| The primary source of sulfur oxide pollution is/are: |
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| coal-fired electric generators |
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| If pure coal burned completely, it would produce: |
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| when sunlight reacts with automobile exhaust |
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| T/F The Clean Air Act has not led to a decrease in the total pollution level or improved air quality in the United States in the past 30 years. |
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| T/F Ozone is both a pollutant and a beneficial component of the atmosphere, depending on elevation. |
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