This book is a good resource for a classroom discussion about oceans. It talks about the different shapes of different oceans, what kinds of things live in the ocean, the type of water and rocks that can be found in the ocean, food that we get from the sea, transportation across the oceans, and how the ocean is polluted. This book is very dense in its content and goes very in depth about different aspects of the ocean. This would be a good resource for grades 4-6. ( )