Provides information on marine life, including what factors determine where marine species live, how diverse marine life is, and what are some ways in which humans and marine species interact.

"What adds up into an ocean? Build one layer by layer to find out. The watery world looks very different the deeper we get. Once we get down to the bottom, it's time to get creative to make your own ocean environment. Colorful illustrations paired with bright photos help young readers learn how to build our world"--

Find out about the five great oceans on our planet, and learn about their biological and geographical features. Explore the deepest depths of the Mariana Trench, spot shipwrecks at the bottom of the sea, and uncover the beauty of the Great Barrier Reef.