"Introduce young readers to the wonders of the sea and answer little kids' big questions about these incredible marine environments. How deep is the ocean? Did you know there are underwater volcanoes? How many species live in the sea? Why do tsunamis start? From the depths of the Mariana Trench to vibrant coral reefs, let this book be your guide to the mysteries of the seven seas. An astounding 80 percent of the ocean has never been explored, mapped, or even seen by humans. We've explored more of the moon and Mars than we have our own ocean floor! Oceanographers and marine biologists have much to learn, and Kid Oceanographer tracks their amazing discoveries. This accessible book breaks difficult concepts down into kid-friendly language, so learning about life down below is easy and fun for everyone." -- Provided by publisher.