How much of Earth's surface is covered by water? How do the northern lights get their colors? Planet Earth has been home to mankind for hundreds of thousands of years and while scientists have learned a lot about it, they're still unraveling many of its mysteries. B is for Blue Planet: An Earth Science Alphabet explains what we do know about our planet and what more we have to learn. Examine Earth's diverse ecosystems (deserts), discover geological wonders (karst caves), learn about weather phenomena (hurricanes), and much more. Ruth Strother has been in the publishing industry for more than twenty years and is the author of fifteen books for children. She also wrote Sleeping Bear's W is for Woof: A Dog Alphabet. Ruth lives in Southern California. Bob Marstall was a K-12 art teacher for many years, and today he is an award-winning children's book illustrator. He tours all over the country, lecturing in schools on the integration of art and science. Bob lives in Northampton, Massachusetts.