What are the polar lights? Read this book to discover explanations from both myths and science. The Polar Lights: Myths and Science is at Oxford Reading Level 10. It is for readers aged 7 to 11 years old who are working below expected standard in their reading. The Readerful Rise series ensures that older struggling readers have books with age-appropriate content and topics, that look like the books their peers are enjoying, but are written at a level they can read successfully.