Explanation: The heat produced in the interior of the earth is thought to be the driving force behind plate tectonics. That heat creates convections currents that can be observed in volumes of air and liquid is a known fact.
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Candela is the correct answer. In measuring the brightness or luminosity of the bulb and you want to use the metric system, candela is the unit to be used. You are correct that candela is the unit of light intensity. The term candela is the Latin for candle which signifies light.<span> </span>
