Question

which of the following is true about impervious building materials?
a. impervious surfaces prevent pollutants from entering the water supply.
b. vegetation and gravel are common impervious materials.
c. having fewer impervious surfaces improves water drainage.
d. all of the above
please select the best answer from the choices provided
a
b
c
d

Explanation:

• Impervious surfaces (like asphalt, concrete) do not filter pollutants; instead, they carry runoff with pollutants into water supplies, so option a is false.
• Vegetation and gravel are permeable (allow water to pass through), not impervious, so option b is false.
• Fewer impervious surfaces mean more areas for water to infiltrate the ground, which improves natural water drainage, so option c is true.

Answer:

C. Having fewer impervious surfaces improves water drainage.