Practice Class 9 MCQs From Textbooks
Physics Practice Questions MCQ e-Book PDF | Class 9 Physics App Download
Class 9 Physics Practice Test: MCQs for Exam Prep
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The change in the quality of the environment that can be harmful and unpleasant for living things is called
A temperature rise in the environment that disturbs life is called
Natural processes such as volcanic eruptions, forest fires causes
The value of the speed of light is
Fossil fuels are burnt to produce electricity in
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