Planet Earth, Grades 4-6+, by David Stewart (2002). Ages 9-12.
Geology Rocks!: 50 Hands-On Activities to Explore the Earth, by Cindy Blobaum (1999). Ages 9-12. Lively and entertaining. From Amazon, "I have used this book for my children's homeschool study, and it is FANTASTIC!"
Cool stuff we've been enjoying: Looking for birthday gifts? Check out these new Chromebooks - all the computer you need for only $229.00!. Then study in peace with these Beats wireless headphones - for the exact same price! When you're done, show off your presentation or watch a movie with this excellent smartphone projector for only $39.99!