Question

Which factors should be switched to correct the errors?

saltwater intrusion and sinkholes
mining and coastal erosion
saltwater intrusion and mining
sinkholes and coastal erosion

Answer 1

I don’t have the original diagram/table you’re working from, so I can’t tell which two labels need swapping. I can help you decide — here’s how to tell which pair is wrong and should be switched:

Quick checklist — where each factor belongs
- Saltwater intrusion: occurs in coastal aquifers or near estuaries where excessive groundwater pumping lets seawater move inland.
- Coastal erosion: occurs along shorelines, beaches, cliffs exposed to waves, currents, storms.
- Sinkholes: occur in regions underlain by soluble bedrock (limestone, gypsum) — karst terrain — where the ground collapses into underground cavities.
- Mining (underground mining or large open pits): causes subsidence, spoil piles, contaminated runoff — typically inland at known mining sites.

How to find the error
1. Look at each label’s location on the map/diagram.
2. Ask whether the physical setting matches the factor’s expected environment (coast vs inland, karst geology vs non-karst, known mining area).
3. If two labels are in obviously wrong environments and their correct environments match each other, those two should be switched.

If you paste the diagram or describe where each factor is currently placed, I’ll point out exactly which two should be swapped (and why).