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| the condition of earth's atmosphere at a particular time and place is called what? |
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| Nitrogen is ____% of the gases in the atmosphere. |
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| Oxygen is ____% of the gases in the atmosphere. |
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| ____% of the gases in the atmosphere is all gases except nitrogen and oxygen. |
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| true or false - oxygen forms OZONE when it interacts with lightening. |
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| water in the form of a gas is called what? |
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| how many molecules of oxygen does ozone consist of? |
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