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Tic Tac Toe Science

Across
A toxic gas.
The government regulates the amount of gas people burn.
2 different gasses.
The process that makes carbon monoxide.
A poisonous gas.
The percentage of how much water vapor is in the air.
Measurement of how much water is in the air.
Down
Lead that is the air.
Converts carbon monoxide into carbon dioxide.
A process that keeps the earths atmosphere warm.
A chemical reaction that releases energy.
A process that warms up the earth too much.
The action should be taken when the benefit is worth the cost.
Burned nitrogen that produces gases.
An equation for a substance in a mixture.