whats a sink hole

But what causes these sinkholes and how common are they? Natural sinkholes as opposed to manmade tunnel or cave collapses occur when acidic rainwater seeps down through surface soil... What are Sinkholes? By default, the land surface is hard and can support very heavy loads, including those of trucks, buildings and much more. A sinkhole is a depression in the ground that has no natural external surface drainage. Sinkholes are most common in what geologists call, "karst terrain." These are regions where the types of rock... Sinkholes are workhorse tools used in day-to-day network management, research, and threat

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