Oceans cover 70 percent of Earths surface. This book explores the plants, animals, and environment of this important ecosystem. Learn more in Oceans, an AV2 media enhanced book. Contents: AV2 book code -- What is an ocean ecosystem? -- Where in the world? -- Mapping the oceans -- Ocean climates -- Ocean regions -- Ocean depths -- Life in the ocean -- Plankton -- Nekton -- Benthos -- Oceans in danger -- Science in the ocean -- Working on the water -- Discover ocean density -- Create a food web -- Eco challenge Interest Level: 5-8 Reading Level: 6.9 ATOS Book Level: 6.9 AR Interest Level: MG AR Points: 1 AR Quiz: 151212EN.