Problem: What is the pattern of organization of the following paragraph? Heavy use of groundwater causes a regional water table to drop. In parts of western Texas and eastern New Mexico, the pumping of groundwater from the main underground water source has caused the water table to drop 30 meters over the past few decades. The lowering of the water table means that wells must be deepened and more electricity must be used to pump the water to the surface. Moreover, as the water is withdrawn, the ground surface may settle because the water no longer supports the rock and sediment. Mexico City has subsided more than 7 meters and portions of California's Central Valley 9 meters because of extraction of groundwater. Such subsidence can crack building foundations, roads, and pipelines. Over-pumping of groundwater also causes compaction and porosity loss in rock and soil, and can permanently ruin good aquifers.