What are the materials that come up from deep under the Earth's surface and are refined to obtain pure metals?
Which of the following is NOT a common source of energy obtained from beneath the Earth's surface?
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Which metal was the first to be discovered by humans and is commonly used in making electric wires?
Which alternative sources of energy are mentioned in the text as substitutes for coal and petroleum?
Which of the following minerals is used to make electric machines?
What is the primary source of energy used at thermal power plants to generate electricity?
Why is it important to use minerals carefully and find alternative sources of energy?
47 videos|121 docs|42 tests
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47 videos|121 docs|42 tests
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