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sinkhole
(redirected from Sinkholes)

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sinkhole

 or sink or doline

Depression formed as underlying limestone bedrock is dissolved by groundwater. Sinkholes vary greatly in area and depth and may be very large. The two main varieties are those caused by the collapse of a cavern roof, and those caused by the gradual dissolving of rock under a soil mantle. Collapsed sinkholes generally have steep rock sides and may receive streams that then flow underground. Soil-mantled sinkholes are generally shallower; they may become clogged with clay and hold a small lake.
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Based on the experiences of a teacher who worked with inmates at San Quentin State Prison, the site features earth-science lessons and activities such as mapping the schoolyard, identifying rocks and learning about sinkholes.
Digging up the schoolyard by Ullman, Ellen / District Administration
In the Arctic, land that was once permanently frozen is collapsing into giant sinkholes.
Field Notes from a Catastrophe: Man, Nature, and Climate Change by Science News
Such paid and unlabeled government propaganda is actually common, especially in such tax sinkholes as the Office of National Drug Control Policy, which has spent $1 billion since 1998 on both direct and unlabeled anti-drug promotions in advertising and TV shows.
Pundit payola: accidental propagandists by Welch, Matt / Reason
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