Leon Gray 
Oceans [PDF ebook] 

Here is the perfect introduction to the places where animals and plants live and grow. Each book explores one of the world’s major biomes and describes its climate, the people who live and work there, threats to the environment, and measures that are being taken to protect it. This book looks at the world’s oceans and how animals and plants have adapted to life in, on, and around salty water. Many swim at the surface, while others lurk in the pitch-black depths beneath.