Circle the letter of each sentence that is true about bringing up groundwater.

a. Most wells are dug with well-digging equipment.

b. A spring is a place where groundwater flows out of
cracks in rock.

c. For a well to work, the bottom of the well must
reach into the unsaturated zone.

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water