index
What is air? What is the atmosphere?
What’s the atmosphere’s role?
How was the Earth’s atmosphere formed?
Is it true the ancestors of plants created oxygen?
Can people live without air?
What is healthy air?
How do plants keep the air clean for us?
Will the air get dirty if forests disappear?
What is air pollution?
Is polluted air bad for our bodies?
What will happen to the Earth if the air becomes polluted?
What are people doing to stop air pollution?
What can I do to stop air pollution?
