According to the clean water act, when is it legal to release pollution into a body of water?

a. when a permit has been issued

b. in an emergency situation

c. if it is organic

d. never

A. when a permit has been issued.

Explanation:

The Clean Water Act refers to the primary federal act in the United States administering water pollution. The chief objective of this act is to preserve and rebuild the physical, chemical, and biological honor of the water of the nation.

According to the Clean Water Act, it is legal to release point source of pollution only in case of permission has been issued by the  National Pollutant Discharge Elimination System (NPDES) which is introduced by Clean Water Act (CWA).

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.