Kate Davies (Author) KATE DAVIES worked as children's book editor before becoming a novelist, screenwriter and picture book author. For Usborne, she has written about everything from butterflies and physics to kings and queens. She's also the author of The Crims middle-grade series, and the picture books The Incredible Hotel and A Mystery at The Incredible Hotel. She lives in London.

Lift-the-flap board book packed full of information and colourful illustrations.

• Chapters in this book include:- Where it all began- The sea you can see- Buried treasure- Tropical waters- Cold as ice- Deeper and deeper- On the move- A sea of change