Which factor causes the greatest increase in an area's flash flood risk?

Densely populated regions with little vegetation.

Explanation:

Flooding refers to a longer event in comparison to flash flooding, it may take a few days or weeks. On the other hand, flash floods are generally featured by intense fast-moving water post heavy rains, which gashes through urban streets, river beds, or mountain canyons sweeping everything coming in their way. They can take place within minutes or a few hours of extreme rainfall. In such cases, the regions with heavy population and comprising little vegetation would be the one that would be most affected.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

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.