As of 2015, some good science books for third-grade students include "Science: A Closer Look" by MacMillan/McGraw-Hill, "Read and Understand Science, Grades 3-4," and "ScienceFusion Student Edition Interactive Worktext Grade 3." The "ScienceFusion" book is an online publication featuring math and science topics.
The "Science: A Closer Look" book series is listed as a resource on the American Museum of Natural History website. Meanwhile, the "Read and Understand Science, Grades 3-4" book received positive reviews on Amazon.com as a supplement to science classroom learning. The "ScienceFusion Student Edition Interactive Worktext" offers online learning features, including 21st Century learning skills and STEM skills.
A good resource for science books for third graders is Lakeshore Learning, which sells books on science topics.