By Beth Geiger
Earth’s Air: Layers for Life explores our atmosphere from the bottom up.
Students learn how this amazing mixture of gases keeps Earth warm and
provides life-giving oxygen. They investigate the characteristics of each
atmospheric layer and learn how human activities affect these layers.
Students also discover how energy from the Sun powers the water cycle
and winds. At the end of each two-page spread, a brief statement called
The Bottom Line reinforces students’ understanding by summing up the key
ideas about the atmosphere covered in those pages.
Lexile: 850L
ISBN: 978-1-933798-59-1
