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 Marriage Below Zero A Marriage Below Zero A Marriage Below Zero is a novel by Alan Dale. Published in 1889, it is described as the first English-language novel portraying a romantic relationship between two men. The book is told from the point of view of Elsie Bouverie, a pretty, frivolous English girl who falls in love with handsome, quiet Arthur Ravener. They marry, and Elsie gradually comes to realise that she has competition for Arthur's affection in the form of Captain Dillington, Arthur's male lover. Elsie engages a private detective who provides her with an address in Notting Hill; she goes there to