Construction contributes to soil erosion because...

Construction of roads and buildings, logging, mining, and agricultural production have resulted in large amounts of soil erosion in the U.S. and around the world. Leaving the soil surface with little or no vegetation provides a prime opportunity for soil to be eroded by wind or water moving across the soil surface.

Explanation:

i think that c)gold was found there

but i am not sure

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.