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Key Points

3 points

1

Oxygen helps us breathe and is safe.

2

Carbon dioxide is a gas we exhale.

3

Some gases can be dangerous if not used properly.

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Summary

Learn about the air we breathe and other cool invisible stuff!

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New Words to Learn

3 words

molecule

tiny building block that makes up everything

hazardous

something that can be harmful

reactive

likes to change when it meets other things

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