Subsidence - Wikipedia
Subsidence frequently causes major problems in karst terrains, where dissolution of limestone by fluid flow in the subsurface causes the creation of voids (i.e., caves). If the roof of these voids becomes too weak, it can collapse and the overlying rock and earth will fall into the space, causing subsidence atBBC - GCSE Bitesize: Quarrying,Limestone quarrying provides employment opportunities that support the local economy in towns around the quarry. Quarrying is a heavy industry that creates noise and heavy traffic, which damages,PEH:Drilling Problems and Solutions - petrowiki.org,Drilling problems can be very costly. The most prevalent drilling problems include pipe sticking, lost circulation, hole deviation, pipe failures, borehole instability, mud contamination, formation damage, hole cleaning, H 2 S-bearing formation and shallow gas, and equipment and personnel-related problems.