Polar Bear, Why Is Your World Melting? (Wells of Knowledge Science)
In the Arctic, the summer ice is melting, making it hard for polar bears to survive. Why is the world getting warmer? The heat of the sun is trapped by the "greenhouse" gases that surround Earthcarbon dioxide, methane, nitrous oxide, and water vapor....more
Robert E. Wells is the author and illustrator of many intriguing and award-winning science books for children. He lives with his wife in Wenatchee, Washington.
Welcome Robert E. Wells’s books into your classroom, and you’ll find most of
your science curriculum covered. The twelve volumes – engaging and informative,
educational and inviting – provide second through fifth graders with ...more