Our planet is covered in water, but most of the ocean is a mystery - until now. It's time to voyage with seabirds, surf the waves, dodge a polar bear and dive in a submersible - there's a deep blue world to explore. Waterworlds is a book full of incredible cross-curricular information, fun activities, and beautiful illustrated scenes to enjoy. Discover why the sea is blue, how boats float, and the rhythm of the tides, before flipping the book to read about the hidden world beneath the waves. Find out what lives in the darkest depths of the ocean, how to make your own shipwreck treasure and explore the wonders of a coral reef.