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Sinkhole. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet. [1][2][3][4] A ...
The Great Blue Hole, a giant submarine sinkhole, near Ambergris Caye, Belize The following is a list of sinkholes , blue holes , dolines , crown holes , cenotes , and pit caves . A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.
The caves are sited within the Bungonia State Conservation Area adjoining the Morton National Park, about 35 kilometres (22 mi) east of Goulburn and about 125 kilometres (78 mi) south-west of Sydney. [citation needed] The caves are formed in limestone at the southern extremity of the Sydney basin, a broad expanse of New South Wales between this ...
Well of Barhout. Location. Al-Mahara, Yemen. Coordinates. 17°20′25″N 52°26′38″E / 17.34028°N 52.44389°E / 17.34028; 52.44389. Depth. 112 m (367 ft) The Well of Barhout (also nicknamed Well of Hell) is a sink hole in Al-Mahara, Yemen. It has a circular entrance that measures about 30 m (100 ft) wide at the surface, and it ...
Privy digging. Removing rocks and other debris in a very large urban privy (c. 1855). Privy digging is the process of locating and investigating the contents of defunct outhouse vaults. The purpose of privy digging is the salvage of antique bottles and everyday household artifacts from the past. Privy digging is a form of historical digging and ...
Crack in the Ground is a volcanic fissure about 2 miles (3.2 km) long [1] with depths measuring nearly 30 feet (9 m) below ground level [2] in Central Oregon, United States. The formation of the fissure occurred approximately between 700,000 and 12,000 years ago. [3] The eruptions from the Four Craters Lava Field were accompanied by a slight ...
Kola Superdeep Borehole. The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth, which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1] It is the result of ...
A bedrock mortar (BRM) is an anthropogenic circular depression in a rock outcrop or naturally occurring slab, used by people in the past for grinding of grain, acorns or other food products. [1] There are often a cluster of a considerable number of such holes in proximity indicating that people gathered in groups to conduct food grinding in ...