Book excerpt: Dive into this stunning guide that explores the underwater world, its wildlife, the challenges it's facing and how you can help to protect it.Join your sea turtle guide as you navigate every inch of our oceans, from the sunlit surface to the deepest, darkest depths.This beautiful book will help you explore the five oceans on our planet, meeting the creatures who live there and finding out just how their incredible surroundings work. From tides and currents, to migrations and conservation, see our oceans in action and learn how you can help to save them. This is a great follow-up to the very successful A Cat's Guide to the Night Sky, as it introduces young readers to our oceans, the underwater wildlife and the natural phenomena that take place as well as discussing the challenges we're currently facing and what we can do to help save our big blue world. The book contains a glossary and is suitable for children aged 6+.Written by expert author Catherine Barr, who previously worked as the Greenpeace Sea Turtle campaigner, and with gorgeous artwork from celebrated illustrator Brendan Kearney, this is a must-have for all young readers.