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Question
In ancient times, two stones were rubbed together to produce fire. The stones get heated up due to friction on rubbing and produce fire.
In ancient times, two stones were rubbed together to produce fire. The stones get heated up due to friction on rubbing and produce fire.
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Solution
The correct option is A True
When the stones are rubbed together the surface molecules gain a lot of heat due to friction between their surfaces and there by fire is produced.
When the stones are rubbed together the surface molecules gain a lot of heat due to friction between their surfaces and there by fire is produced.
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