A. new ocean ridges and seafloor
<span>Metal compounds are used since metals have characteristic flame colors </span>
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Homogeneous means composed of parts of different kinds; having widely different elements or components.
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Answer:
For example, friction between our shoes and the floor stop us from slipping and friction between tyres and the road stop cars from skidding. Friction is sometimes unhelpful. For example, if you don't lubricate your bike regularly with oil, the friction in the chain and axles increases.
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