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 Horse Walks into a Bar A Horse Walks into a Bar A Horse Walks into a Bar () is a novel by Israeli author David Grossman. First published in Hebrew in 2014 by Ha'kibbutz Ha'meuchad as , the book was translated into English by Jessica Cohen, and published in the UK by Jonathan Cape in November 2016 and in the US by Alfred A. Knopf in February 2017. The title is derived from a common bar joke. Set in a stand-up comedy show in Israel that takes place over just two hours, the novel recounts the tale of a comic who faces a personal crisis