Answer: C. illuminance of a surface.
a) Incandescence: The phenomenon of light emission by a body as a result of high temperature.
B. Luminous flux : It is the quantity of the energy of the light emitted per second in all directions.
C. Illuminance of a surface :describes the quantity of light emitted by a light source or received at a surface.
D. luminous intensity : the quantity of visible light that a point source radiates in a given direction.
The earth system concept emphasizes on how everything on the earth is interconnected. <span>Earth system in terms of four central components known as the subsystems – the </span>hydrosphere,geosphere<span>, </span>atmosphere<span> and </span>biosphere<span>. I hope the answer helps. Thanks! </span>
<span>diminution in the density of something, especially air or a gas.</span>