This method of treating water kills microbes and removes other contaminates such as heavy metals.
a. boiling.
b. distillation.
c. chlorination

The volume of a sphere is given by v= (4/3) pi r cubed, where r is the radius. compute the volume of a sphere with a radius of 117pm. state your answer in units of cubed.

In an energy pyramid, which level has the most available energy?

When a septic tank backs up a goes in to clean it out