This six book series delves into all aspects of Planet Earth. Explore the relationship between living things and the environment, climate change, sustainability and how the Earth was made. Each book is packed with spectacular photographs, easy to understand diagrams and awesome experiments you can try yourself. NATURAL RESOURCES Food, paper, water, gas – everything we use in our daily lives started out as a natural resource. Some natural resources, such as sunlight, are limitless. However others, like oil, are running out fast! Find out... • How the oxygen cycle works. • How fossil fuels are formed. • How the sun, water and wind can be used to generate energy. ... and much more!