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CK-12 Foundation
Ck 12: Fifth Grade Science: Earth Science: The Sun Earth Moon System
[Free Registration/Login may be required to access all resource tools.] Discusses solar and lunar eclipses, the phases of the Moon, and why the phases occur.
The Wonder of Science
The Wonder of Science: Ms Ess1 1: Earth Sun Moon System
Develop and use a model of the earth-sun-moon system to describe the cyclic patterns of lunar phases, eclipses of the sun and moon, and seasons.