Sinkholes By: Lauren and jennifer 7b

WHAT ARE SINKHOLES?

Sinkholes are holes in the ground that are created by erosion and drainage of water. They can be a few feet across or can be large enough to swallow large buildings. They're often a result of natural activities but can be triggered by humans as well. There are two types: A cover-subcidence sinkhole (slowly appearing) and a cover-collapse sinkhole (suddenly appearing).

HOW ARE SINKHOLES FORMED?

Sinkholes occur in area of lands where bedrock such as limestone or gypsum can be dissolved by water. The bedrock eventually becomes exposed and is worn down over time. The holes often become ponds as water fills up.

DID YOU KNOW?!

http://www.lfpress.com/news/london/2011/07/02/18367031.html

Sinkholes have actually occurred in London Ontario!! It only happened about 6 years ago!

HOW LONG DOES IT TAKE FOR A SINKHOLE TO FORM?

A circular hole typically forms and grows over a period of minutes to hours. Sinkholes may take approxiamately a day's time to stop. A depression forms at the surface, typically over longer periods of time (sometimes as long as years).

WHERE ARE SINKHOLES MOST COMMON?

Sinkholes are most common in the states of !Florida!, Texas, Alabama, Pennsylvania, Tennessee, Kentucky and Missouri. However, they can occur anywhere in the world!

The Deepest Natural Sinkhole in the World was Dean's Blue Hole in the Bahamas, however...

On July.22nd, 2016, Chinese researchers made an announcement that they found the "world's deepest" underwater sinkhole in the South China sea. It is called..

The Dragon Hole!

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