CK-12 Foundation
Ck 12: Fourth Grade Science
[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 4. It has sections on physical science, earth science, and life science. Each of those is broken down into eleven or twelve topics.
The Franklin Institute
The Franklin Institute: Treasures at Sea
Learn about ocean systems and habitats. Lots of reading, writing, games, and interactive activities. Colorful and fun.
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