Which of the following best describes the solar radiation absorbed by and radiated from earth?
a. most incoming solar energy is absorbed by the atmosphere.
b. only a small fraction of energy radiating from earth is from the atmosphere.
c. the earth's surface is responsible for a small fraction of heat radiation to space.
d. earth's surface absorbs little of the energy that strikes as solar radiation.
c
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can you make it bigger i can't see it

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.