The atmosphere is full of ______________ that we call “air.”

Earth’s _______ keeps the atmosphere close to the surface.

A plane can fly 10 miles above the ground.

There are clouds in outer space.

The atmosphere stays close to Earth because

gases are heavy.

Gravity gets weaker the higher up you move.

When there is less gravity, there is less gas.

The air is thinner as gravity gets weaker.

The _______ is the layer of air around Earth.

The air we breathe and the wind we feel are ______ in the atmosphere.

The atmosphere gives us weather.

The atmosphere protects us fun the sun's rays.

_____ is a force that pulls all things closer to Earth.

the layer of air around Earth is called _______

________ is a form of matter that expands.

_____is made from different gases.