View Spread Why Is the Sky Blue? Examines the phenomena and scientific principles behind why the sky appears blue. RL Grades 3 IL Grades 3-5 Details: Product type: Paperback Book ISBN: 978-0-7614-3368-2 Author: Wil Mara Copyright: 2008 Reading Level: Grade 3 Interest Level: Grades 3-5 Paperback Book — $9.23 / $7.85