Answer: Movement of pollutants through the groundwater.
Explanation:
Groundwater is the water that accumulates below the surface of earth crust. This water forms the part of geosphere. The water from river, lakes, ponds and rain seep below the surface of ground through small pores present between the soil aggregates and rocks.
According to the given situation, sand and gravel forms the part of earth crust. The water here is the part of groundwater. The food coloring here is the example of pollutants which seep inside the pores present between the sand and gravel. Hence, polluting groundwater.
The nurse has to do as the client requested. This is because they have to observe the autonomy aspect of the ethical standard which states that the client's must be respected. Autonomy gives the patient power to make his or her own decisions concerning health care.