Our world. "Includes a full map of the world, and answers many questions such as - Where do the Sun & Moon go? What makes the wind blow and volcanoes erupt? How many countries and languages are there? Why is the Earth round and the sky blue? Do all plants have flowers and all rivers flow to the sea? Which is the biggest ocean and the brightest star?" (publisher blurb). How does it work? "This excellent addition to the ever popular Questions & Answers series lifts the flap on all kinds of gadgets, systems and ideas. It answers questions such as How does electricity get into our walls? Why do waves go up and down? and Where does money come from? Perfect for every inquisitive child" (publisher blurb). This cover is featured in the image. Very good condition. All flaps in working order.