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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.

Heat Energy

© emmapratte/iStock/Thinkstock

Heat Energy

One of the most important types of energy on Earth is heat energy. A great deal of heat energy comes from the Sun's light hitting Earth. Other sources include geothermal energy, friction, and even living things. This unit helps students understand what heat energy is, how it is transferred, how it is measured, and how insulation can keep heat in or out.

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