Air has a ______________ and is made of molecules that take up space.

The air has different ____________ at different heights above sea level.

Knowing the air ____________ helps in forecasting the weather.

We know when a storm is coming because the _________ __________ lowers.

PSI is the measure of ___________

A mercury barometer measures this.

Air density depends on both altitude and this.

This is the height above sea level.

This is mixed in with all the air molecules.

You can tell how high you are flying by reading this.

Air pressure is measured in these units.

This is inside each raindrop or snowflake.

Earth’s atmosphere is made up of ____________ layers.

Earth's atmosphere has different layers based on the different ____________.

This layer has about 75% of the Earth's air, even though it is the smallest layer.

Meteors burn up in this layer.

The space station orbits here - above the mesosphere.

This layer is really "space"

This layer gets hotter as you go away from the Earth and is where weather balloons fly.

This layer gets cooler as you go from the Earth's surface up.

The Aurora Borealis are also known as this.

Ozone protects us from _________________ sunlight.

Another way of talking about space is the ____________ layer.

We live in the ___________________.

About ____ % of the air is in the troposphere.