The ground beneath the Nelson's house is beginning to sag and sink. Which of the following is a possible explanation? A. The groundwater has been exhausted. B. The Nelsons have built their home on a continental plate. C. There is too much salt in the soil. D. Leaching is causing the soil to weaken.

I believe the correct answer from the choices listed above is option A. The possible explanation of the statement above would be because the  groundwater has been exhausted. Because of such the pressure beneath needs to be in equilibrium with the one above causing the ground to sink.

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then that particular organisms become extinct.