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Physical Science

Reading Levels These books contain three developmentally appropriate reading levels for each grade span.

Low
Mid
High

Each level of the book conveys similar concepts, images, and vocabulary.

Light Energy

© Zoonar RF/Zoonar/Thinkstock

Light Energy

Our universe and our world are awash in light. This unit helps students explore the nature of light, the movement of light, natural and man-made sources of light, and the special behaviors and properties of light. It also explores how colors are formed and how the human eye enables us to see.

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