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National Geographic: Jason Learning
[Free Registration/Login Required] Educators and students will enjoy visiting the JASON Project, a NASA and National Geographic cooperation which works to provide accurate and intriguing scientific knowledge for students.
ReadWriteThink
Read Write Think: I Wonder: Writing Scientific Explanations With Students
Students choose a question to explore, research it using a variety of resources, organize their information on a TCF chart, and then collaboratively write a class scientific explanation.