Earth's air is one of its four big parts. The wind is air that is moving.

The air starts at the ground. It fills the space all around Rafael on the hill.

The same air goes up past the kite.

The air goes up past the plane too. Higher up, there is less and less air.

Far above the plane, the air ends, and space begins.

Seen from space, the air is a thin layer wrapped around the whole Earth.

Earth from space. The thin pale ring around the ball is the layer of air.

Clouds float in that layer of air.

In a cloud, the drops are Earth's water. In a cloud, the air is Earth's air.

Clouds float in the air above a field. In a cloud, the drops are Earth's water, and the air is Earth's air.