Johnson, Sylvia A., How Leaves Change. Minneapolis: Lerner Publication Co., 1986.
Describes the structure and purpose of leaves, the ways in which they change as part of the natural cycle of the seasons, and the process that creates their autumn colors.
Kalman, Bobbie, The Air I Breathe. New York: Crabtree Publishing Company, 1993.
This book explores the importance of air to all living things, how weather is made, and how air pollution threatens the earth.
Lauber, Patricia, Be a Friend to Trees. New York: Harper Collins, 1994.
This book discusses the importance of trees as a source of food, oxygen, and other essential things.
Maestro, Betsy, Why Do Leaves Change Color? New York: Harper Collins Publishers, Inc., 1994.
Explains how leaves change their colors in autumn and then separate from the tree as the tree prepares for winter.
Parker, Steven, Look At Your Body: Lungs. Brookfield, Connecticut, 1996.
This book presents a look at the respiratory system done with great drawings.
Royston, Anyla, Plants and Us. Des Plains, Illinois: Heinemann Library, 1999.
Surveys the many uses of plants, including food, drink, spices, and herbs, creams, and perfumes, medicine, wood and paper, clothes, and decoration for gardens and parks.
Silverstein, Dr. Alvin, Virginia, and Robert, The Respiratory System. New York: Twenty-First Century Books, 1994.
This book explains the respiratory system. It has many diagrams, pictures, and a comprehensive glossary.
Suess, Dr., The Lorax. New York: Random House, 1971.
Story with ecological warning about what will happen if we do not heed the warnings to take care of the earth.
Zion, Gene, The Plant Sitter.
This book is out of print but if you can find a copy in your local or school library it is a good story to begin a plant unit.