What AboutPlanet Earth Author:Brian Williams, Steve Parker This superbly illustrated Question & Answer book answers more than 70 questions to help you understand the key subject areas.Discover how much the Earth weighs, what starts an avalanche, why the sky is blue, plus many more exciting facts.Test your friends and impress them with your knowledge using the challenging quiz pages, and learn exciting n... more »ew facts in the easy-to-use fact panels.Accurate illustrations and photographs create a visual fact finder packed with essential information on the forces and activity that shape our planet.« less