What is sinkhole - why do they take place?
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M$3 Answers
You can read a whole lot more on the topic at the article in source. It also has a map showing areas most prone to skink holes.
An example of a sinkhole. Sinkholes are also not always so large, sometimes they can be very small, bucket sized even.
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M$You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by ground water circulating through them. As the rock dissolves, spaces and caverns develop underground. Sinkholes are dramatic because the land usually stays intact for a while until the underground spaces just get too big. If there is not enough support for the land above the spaces then a sudden collapse of the land surface can occur. These collapses can be small, as this picture shows, or they can be huge and can occur where a house or road is on top.
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M$
This answer contains none of your own words... at all and doesn't even offer new information as you even used the source from my answer. You didn't even find your own image.
Please, read these pages on Mahalo answers etiquette as they have been linked to you a plethora of times.
http://www.mahalo.com/mahalo-copying-and-pasting-guidelines
http://www.mahalo.com/mahalo-answers-etiquette
http://www.mahalo.com/how-to-get-a-best-answer-on-mahalo
