The finely divided red, brown, and yellow soil coloring originates by what process?

a. mechanical weathering of the feldspar and micas in granite and ryholite
b. chemical weathering of quartz and feldspar
c. preciptation of iron oxides during the chemical weathering process
d. mechanical weathering of very fine grained blue grey clays

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.