Question

what is a major risk associated with groundwater use? it can evaporate leaving sediment behind. it can be contaminated by pollutants. it can become over run with algae.

Explanation:

Groundwater is water that exists underground in soil pores and fractures in rock. One of the major risks associated with its use is contamination. Pollutants such as chemicals from industrial waste, fertilizers and pesticides from agricultural activities, and sewage can seep into the groundwater. Once contaminated, groundwater is difficult and costly to clean. Evaporation leaving sediment behind is more of a characteristic associated with surface water in some arid regions (e.g., salt flats from evaporated lake water). Algae overgrowth is typically a problem in surface water bodies like lakes and rivers where there is sufficient sunlight for algae to photosynthesize and nutrients (like excess phosphorus and nitrogen) to fuel their growth. Groundwater is generally in the dark (below the surface) and not prone to algae over - growth in the same way as surface water.

Answer:

It can be contaminated by pollutants.