Meet Ocean they make up 70 percent of Earth's surface! Alongside Ocean, readers will be introduced to the world's oceans and seas. They'll learn about the layers of the ocean and explore the deepest, leastexplored recesses of the Mariana Trench. Students will meet bioluminescent anglerfish, warm up at hydrothermal vents, and surf waves in the Atlantic. A quick quiz at the back of the book gives readers the opportunity to test their new knowledge. To learn more about the science of Earth, check out other titles in the Building Blocks of Geography series!.