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What gas makes up 78% of our atmosphere?
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Nitrogen
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When a candle burns, what happens to the oxygen?
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It is burned up.
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The condition of Earth’s atmosphere at a particular time and place is called….
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Weather
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T or FSmoke is made up of solid particles in the air.
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True
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What gas makes up 21% of our atmosphere?
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Oxygen
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The atmosphere protects us from harmful rays of the sun plus…..
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meteoroids
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Water vapor is a liquid and steam is a gas.
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True
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The more molecules in a volume of air, the greater it’s …..
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Density
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Plants take in carbon dioxide and give off ….
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Oxygen
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Air has mass because it is composed of …..
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Atoms and Molecules
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Density increases if we put ___ molecules in it.
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More
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The amount of oxygen is less at
high or low altitudes?
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High
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What do we call an instrument used to measure air pressure?
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Barometer
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As air pressure decreases, what happens to the column of mercury?
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It sinks
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Mercury is one type of barometer. Name another type.
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Aneroid
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Inches of mercury is one way we express air pressure. What is another?
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Millibars
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What is another word for elevation?
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Altitude
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Air pressure is weakest.
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On a mountain top