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15
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Which gas do humans need to breathe in to stay alive?
Nitrogen
Oxygen
Carbon dioxide
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baam
Lose 20 points!
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magnet
Take 5 points!
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gift
Win 20 points!
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thief
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25
15
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Why is nitrogen the most common gas in the air?
It does not react easily
It is heavy
Plants make it
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15
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When testing air pollution near roads, what is the independent variable?
Location
Pollution level
Weather
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15
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Cigarette smoke is harmful because it ____
Contains toxic chemicals
Contains clean gases
Has oxygen
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15
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Which of these is a source of air pollution?
Wind
Cigarette smoke
Fresh air
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15
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Which of these is a harmful air pollutant?
Nitrogen
Smoke
Oxygen
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15
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What happens to air quality when pollution increases?
It stays the same
It becomes cleaner
It becomes worse
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15
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Which variable should be kept the same (controlled) in an air pollution investigation?
Number of cars
Distance from road
Type of measuring tool
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15
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Why is breathing polluted air harmful?
It can damage lungs
It makes air heavier
It helps lungs work better
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15
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What gas makes up most of the air we breathe?
Nitrogen
Carbon dioxide
Oxygen
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15
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Which tool can be used to observe air pollution levels?
Rain gauge
Thermometer
Air quality sensor
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eraser
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gold
Win 50 points!
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fairy
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25
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banana
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15
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Which activity causes air pollution?
Planting trees
Rainfall
Burning fuels
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baam
Lose 25 points!
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star
Double points!
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rocket
Go to first place!
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thief
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25
15
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Which gas helps plants make food during photosynthesis?
Carbon dioxide
Oxygen
Nitrogen
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