Examines the characteristics and locations of the world's oceans, and takes a look at the various food chains that exist there, beginning with plankton and ending with top predators. Also discusses scavengers in the ocean, and how to protect food chains. Includes color photographs, a glossary, and further resources.
An introduction to dental hygiene that describes teeth, explains what causes tooth decay, discusses how to properly clean teeth and what makes them stronger, and includes related activities.