6 Wind

Wind written by Marion Dane Bauer illustrated by John Wallace

The earth we live on is a spinning ball.

When the earth spins, the air around it moves too.

When air moves, we call it "wind." As the sun heats the air, the air grows lighter. Light air rises. Cool air is heavy. It falls.

Cool air and warm air are always trading places. We call this movement "wind."

Birds use wind to help them fly.