By which process copper is refined ____________?

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Vitamin A is found in the____________?

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Bore is caused by______?

A. Rising tide while meeting river currents B. Friction from prevailing winds C. Spring tide and strong winds D. Unequal heating of oceans...

What is meant by “Equinox”?

A. The longest day B. The shortest day C. The sun-month long day D. Equal duration of day and night...

Gulf streams are caused by__________.

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Which product is obtained in the manufacture of soap from oils:

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