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Discovery Education
Discovery Education: The Phenomenon of Sound Waves
A lab activity on sound waves is presented on this website. Students will learn about sound waves produced by different objects in this activity. There are also a set of discussion questions and two other variations of the lab exercise.
CK-12 Foundation
Ck 12: Earth Science: Metamorphic Rocks
[Free Registration/Login may be required to access all resource tools.] Covers metamorphic rocks, which form from previous rocks exposed to heat and/or pressure.
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