Sinkhole may exhibit a visible opening into a cave below. In the case of exceptionally large sinkholes, such as the Minyé sinkhole in Papua New Guinea or Cedar Sink at Mammoth Cave National Park in Kentucky, an underground stream or river may be visible across its bottom flowing from one side to the other. Sinkholes are common where the rock below the land surface is limestone or other carbonate rock, salt beds, or in other soluble rocks, such as gypsum, that can be dissolved naturally by circulating ground water. Sinkholes also occur in sandstone and quartzite terrains. As the rock dissolves,
A Matter of Minutes of a voice which seems to be commanding the workers, but then turn once the voice commands the workers to capture the Wrights. Confused and frightened, the couple run into a back alley and enter a void of white space. They discover a man in yellow who helps them out of the void and explains to them that he is the supervisor of the maintenance of time. They have somehow slipped into a loophole and while they should be in an earlier time - 9:33 a.m. - for some reason they have hopped over into 11:37 a.m. Showing them exactly