Which consequence results when groundwater extraction increases behind a barrier island?

💡 Explanation

Increased groundwater extraction lowers the water table, causing saltwater intrusion because of hydraulic gradient changes, leading to the aquifer's contamination; therefore, saltwater encroaches rather than the freshwater lens expanding, due to reduced freshwater recharge.

• Which atmospheric effect sharply defines subtropical high-pressure zones around 30 degrees latitude?
• What primary outcome arises from increased coastal sandstone erosion due to intensified wave action?
• Which outcome commonly results following extensive groin construction inhibiting longshore sediment transport near barrier islands?
• Which outcome occurs in a delta plain's distributary channels because natural levees collapse?
• Which mechanism is triggered when differential stress exceeds static friction along an existing fault line?
• Which mechanism causes buoyant magma to ascend during intraplate volcanism?