About Lesson
Unit 1… Our World
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Lesson 5: Earth’s structure
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Lesson 4: Rotation and Revolution
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Lesson 7 Rocks and Minerals
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Lesson 8 Volcanoes
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Earthquakes
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Weathering
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Chapter 13 Atmosphere
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Chapter 14 Insolation
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Atmospheric pressure
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Chapter 16 Humidity
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Chapter 17 Pollution and its types
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Sources of pollution
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Pollution effects and preventive measures
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Chapter 12 Hydrosphere
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chapter 3 Geographic grid
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Climate Chapter 3
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1.Structure of the Earth
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