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Knows that air is a substance that surrounds us, takes up space and whose movement we feel as wind.

There's Air in There!

Air pressure. Air has mass and takes up space. This is sometimes a difficult concept for kids to really understand.

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How Thick is the Atmosphere?

We've all seen pictures of the Earth and its atmosphere as a series of concentric circles, showing the troposphere, stratosphere, ionosphere, etc., often looking like a bullseye target with the solid Earth in the middle. But if we were to draw that picture to scale, what would it really look like?

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