SCIENCE
Parker, Steve

Light and Sound

(4) 4-6 Science Fact Files series. These are adequate introductions to physics. The concepts of combined and balanced forces, momentum, chemical and electromagnetic sources of electrical energy, and amplitude and frequency in wave motion are all covered clearly; and explanatory analogies are well chosen. Color photos and diagrams are well used but add to the crowded design. Bib., glos., ind.

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