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,
The Story of the Man Who Turned into a Dog of its surrounding countries, including Peru, Chile, Bolivia, and Uruguay. By 1956, the movement had died out, following the collapse of the Juan Perón political regime. The Story of the Man Who Turned into a Dog The Story of the Man Who Turned into a Dog (Historia del hombre que se convirtió en perro) is a short play written by Osvaldo Dragún as part of his "Historias para ser contadas" ("Stories to be Told"), a series of short plays. It is the third short play in the series. The original production premiered with the independent theatre group Teatro Popular Fray