Question

If you are drilling a well to reach water, you usually will have to drill:

A) To the same depth, wherever you were.B) Farther into the ground to make a deeper well in a valley than on a ridge.C) Farther into the ground to make a deeper well on a ridge than in a valley.D) To a random and unpredictable depth unrelated to where you are drillingE) Into a cave, because only caves contain water underground.

Answer 1

C) Farther into the ground to make a deeper well on a ridge than in a valley.

Step-by-step explanation:

The water table in streams reaches the surface and is close to the surface above lakes, so that in valleys only shallow wells would be required. Water runs from ridges to valleys, causing deeper wells the water table becomes deeper underneath ridges. Water can be contained in much smaller areas than caves in certain rocks, so you don't have to enter a cave and you don't really want to, because caves can be easy pathways for pollutants and surface pollutants.

Hence, The correct answer is C