Question

a farmer is analyzing cross sections of his land to determine where to build a well. which phrase describes the best area to dig down to the groundwater? where the saturated zone is 15 meters deep where the water table is at 100 meters deep where the unsaturated zone is 50 meters thick where there is a 25-meter thick clay layer at the surface

Explanation:

To determine the best area to dig for groundwater, we analyze each option:

• "where the saturated zone is 15 meters deep": The saturated zone contains groundwater. A shallower saturated zone means less depth to dig to reach groundwater, making this efficient.
• "where the water table is at 100 meters deep": A deep water table requires digging 100 meters, which is impractical.
• "where the unsaturated zone is 50 meters thick": The unsaturated zone has little to no groundwater; a thick unsaturated zone means more depth to reach the saturated zone.
• "where there is a 25 - meter thick clay layer at the surface": Clay is impermeable, so water may not infiltrate easily, and digging through clay is difficult.

Answer:

where the saturated zone is 15 meters deep