Lucas built a model to show the effect of human population growth on an aquifer that supplies water for a growing city Recent
measurements show that the levels of water in the aquifer are dropping at a rate that correlates with population growth.
Lucas placed a tub under a stream of water until the tub filled and began to overflow. Then he used a water pump to begin
removing water from the tub. At first he pumped slowly, and the water still overflowed. Then he pumped harder until, eventually, the
water level in the tub began to go down
What is represented by the pump in this model?
OA. the containment of the water in an underground area
OB. the water that enters the aquifer due to precipitation and runoff
OC. the amount of water that flows out of the aquifer as natural springs
OD. the amount of water from the aquifer that is used by the city
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