More than 200 topics concerning science are answered in this fascinating children's encyclopaedia. As to why chocolate melts, Where does the wind originate? How do we know there were dinosaurs? This completely updated, information-packed children's book provides answers to all the questions kids have about how the world works, including some they haven't even considered. Children between the ages of 7-9 can take pleasure in learning about all facets of science, from forces and magnets, light, sound, and space to animals, plants, and the human body. Each page poses a fresh query and offers illuminating writing and stunning images to address it, delivering interesting knowledge to aid children in understanding the fundamentals of biology, chemistry, and physics. Why Is the Sky Blue? by DK is the perfect scientific book to pique interest.