Discover how the ocean changes as it goes deeper, how deep sea animals survive in harsh environments, and more. A True Book: Earth Science series presents fascinating facts and fun activities that will engage the budding earth scientist, while exploring the fields of geology, meteorology, ecology, and more. This series includes an age appropriate (grades 3-5) introduction to curriculum-relevant subjects and a robust resource section that encourages independent study. Earth's oceans are almost like a foreign world, filled with millions of strange, fascinating animals and plants. Oceanographers dive into the watery depths to learn more about the incredible ocean ecosystems that make up the majority of our planet.