G11

• Natural causes of sinkhole dissolution sedimentary sinkhole
• Natural causes of sink hole - dissolution sedimentary rock
• Dissolution sedimentary rock Sinkholes occur when sedimentary rocks are dissolved. When these rocks are dissolved, it can either form a void of water or air. A void filled with air forma a hole and a void filled with underground water makes a lake or a pond. Sinkholes can be in the form of holes or depressions on the ground
• Human cause sinkhole underground water pumping
• Underground water pumping Pumping water underneath the ground causes drainage to alter their flow which causes the soil to be eroded by water. Broken pipes underneath the ground can also cause internal erosion making a void underneath the ground. Altering drainage systems cause water to branch into other routes where there is soluble rock can cause erosion through the flow of water.
• Cover Collapse Sinkhole

  Develop abruptly (over a period of hours) and thus cause catastrophic damages. They occur where the covering sediments contain a significant amount of clay. Over time, surface drainage, erosion, and deposition of sinkhole into a shallower bowl-shaped depression
• Cover Subsidence Sinkhole

  Develop gradually where the covering sediments are permeable and contain sand. In areas where cover material is thicker or sediments contain more clay, cover-subsidence sinkholes are relatively uncommon and therefore may not be seen frequently. They are smaller and thus may go undetected for long periods