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== = = = = Sinkholes are holes in the ground and are caused usually by both the removal of soil and bedrock, but can also happen one only one is removed. The speeds that sinkholes occur vary. It could happen right when the soil is taken away or it could happen gradually.
 * //Sinkholes Are...// ** 

  There are two basic kinds of sinkholes: Sinkholes that occur on land and sinkholes that occur underwater. On-land sinkholes are usually just basically called, well, sinkholes. Underwater sinkholes are called Blue Holes.    Sinkholes occur commonly in places where the rock below the land has rocks, salt beds, carbonate rocks, and limestone can naturally dissolve by ground water that is circulating through them. As the rock dissolves, large caverns and spaces appear underground. Sinkholes are usually pretty dramatic because the land usually stays intact until the caverns underground get too large and collapse. The collapses of sinkholes can be either very small or very large. The large ones usually occur when a house or road is located overhead. Most damage of sinkholes tend to occur in these areas: Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania. They could also happen when abandoned mines collapse. <span style="font-size: 12.5pt; color: rgb(51,153,102); font-family: Arial;"> <span style="color: rgb(0,204,255); font-family: Georgia;">Also, over burden sediments that cover buried cavities in aquifer systems are delicatley balanced by ground-water fluid pressure. Another reason is that pumping for urban water can cause sinkholes. Also, irrigation can produce new sinkholes in sinkhole-prone areas, which are listen above. The pumping can result in grown-water level lowering and then udnerground structural failure. At that time sinkholes can occur. <span style="font-size: 12.5pt; color: rgb(0,204,255); font-family: Arial;">
 * <span style="font-size: 16pt; color: rgb(0,204,255); font-family: Georgia;">//Kinds of Sinkholes// **
 * <span style="font-size: 16pt; color: rgb(0,204,255); font-family: Georgia;">//Other Info// **

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