National Geographic Primary Readers is a high-interest series of beginning reading books that have been developed in consultation with education experts. The books pair magnificent National Geographic photographs with lively text by skilled children-s book authors across four reading levels.What causes thunder and lightning? How do different clouds form? What makes a tornado twist? Kids will discover the answers to these questions and more in this colourful, photo-packed book.In this inviting and entertaining format, kids will discover what causes the weather they experience every day. This level 2 reader is written in an easy-to-grasp style to encourage the meteorologists of tomorrow!Level 2: Becoming fluentThese books are a good match for kids who are developing reading stamina and enjoy a longer book. They are ideal for readers of Green, Orange and Turquoise books.