Importance of Water Quiz App Download - Grade 7 Science e-Book
Class 7 Science MCQs - Chapter 13
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In our body, percentage of water is
An addition of small dose of chlorine gas to the filtered water is known as
Skin diseases, eye infections and diarrhea are the examples of
The process in which water is passed through filter beds of sand and gravel to remove smaller particles of dust is called
The sea which joins the ocean is
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