Here are the three books of Hannah Bonner's award-winning When series under a single cover, with updated scientific facts and a new section of engaging activities and extra information.

Featuring cartoons and Common Core alignment activities for teachers and kids, this book is a wonderful addition to any science class, library, or home bookshelf.

Enjoy a humorous stroll through 200 million years of life on Earth, from when plants and animals first crawled onto land all the way to the dawn of dinosaurs. Along the way you will encounter fearsome fish, giant insects, towering trees, bizarre sea monsters and much more, served up with great illustrations and plenty of humor.