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"Nitrogen Cycle" Properties and Transformations of Matter PPT (Lesson 2 Ammonia and Ammonium Salts)
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"Water Cycle Process and Geographic Significance" Natural Geographic Elements and Phenomenon PPT Courseware
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"Hydosphere and Water Cycle" Looking at the Surface Environment from the Earth's Sphere PPT (Lesson 2)
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"Hydosphere and Water Cycle" Looking at the Surface Environment from the Earth's Sphere PPT Courseware (Lesson 2)
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"Nitrogen Cycle" Nature and Transformation of Matter PPT (Transformation and Generation of Ammonia in the Second Lesson)
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