Notes

Reading level: 3-4. Interest level: 3-6.
Contents: What is the atmosphere? -- The industrial revolution -- Fossil fuels -- Transportation and the atmosphere -- How can humans help?
Summary: Nitrogen, oxygen, argon, and carbon dioxide are all gases in Earth's atmosphere. But what happens when there is too much or two little of a certain gas? Readers will learn how every day activities such as driving, heating buildings, and using aerosols release harmful gases into the air and how it affects the air we breathe.
Fact finders.
Humans and our planet.