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Chapter 16 LIGHT
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Chapter 18 POLLUTION OF AIR AND WATER
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Chapter 17 STARS AND THE SOLAR SYSTEM
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Chapter 15 SOME NATURAL PHENOMENA
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Chapter 14 CHEMICAL EFFECTS OF ELECTRIC CURRENT
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Chapter 13 SOUND
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Chapter 12 FRICTION
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Chapter 11 FORCE AND PRESSURE
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Chapter 10 REACHING THE AGE OF ADOLESCENCE
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Chapter 9 REPRODUCTION IN ANIMALS
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