CBSE - Class 04 - Science - Air and Water

Air and Water Free online tests for class-4 EVS (Environmental Science including both Science and Social Science) as per NCERT and CBSE syllabus includes air composites, air pollution, oxygen, winds, storm, breeze etc Water water sources, how water becomes dirty, sea water, how salt separated from seawater, rivers, sea, properties of water, solid-liquid-gas form of water, water cycle

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