With a vast karst landscape, or areas that lie over soluble rocks such as limestones, the Philippines is no stranger to sinkholes, like what have been seen in northern Cebu in the past few weeks. As pointed out by the United States Geological Survey (USGS), a sinkhole is a depression in the ground and is most common in karst landscapes, or regions where rocks below the surface can be dissolved by water circulating through them. For instance, when rainwater moves down through the soil, soluble rocks such as salt beds and domes, gypsum, limestone and other carbonate rock begin to […]... Keep on reading: Sinkholes in Cebu after earthquake: What are they?