Importance of Water Quiz e-Book PDF | Class 7 Science App Download
Class 7 Science Cerification Guide: Practice Test 11 (Chapter 13)
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To prevent excess use of tap water, we can collect
The unwanted substance of water may be harmful for
Polio, hepatitis and typhoid are examples of
Which gas is often used as a energy source at the city's wastewater treatment plants?
The removal of salt from water on a large scale is known as
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