Final answer:
As a consequence of pore collapse due to groundwater depletion, land subsidence, saline intrusion, contamination, and flow reversal can occur.
Step-by-step explanation:
The consequence of pore collapse due to groundwater depletion include:
a) land subsidence: as the groundwater is pumped out from aquifers, the pore spaces in the rocks get empty causing the land to sink or subside.
b) saline intrusion: overpumping of fresh water aquifers near ocean coastlines can cause saltwater to infiltrate into the freshwater zones.
c) contamination: as groundwater flows and spreads the pollutants, the depletion of groundwater can lead to the dispersion of contaminants over a wider area, affecting water supplies for humans and wildlife.
d) flow reversal: the direction of regional groundwater flow can change due to the drop in the water table around a cone of depression in an unconfined aquifer, which can send nearby pollution toward the pumping well instead of away from it.