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How are sink holes formed? By Ella and Lucy

By Lucy D and Ella K

Elizabeth Harris

on 25 November 2015

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Transcript of How are sink holes formed? By Ella and Lucy

Natural sinkholes occur due to underground water or erosion.
Sinkholes are formed when the limestone from underneath the earths surface dissolves and cracks enlarging the acidic water underneath causing the land to collapse or sink.

How are sinkholes formed?
Humans are also responsible for the formation of sinkholes. Activities like drilling, mining, construction sites,broken water or drain pipes and even heavy traffic can be a result of a small or large sinkhole. Water from broken pipes or drains can go through mud and rocks and erode the ground underneath which can also lead to sinkholes. Sometimes, heavy weight on soft soil can result in collapse of ground, resulting to a sinkhole.
What are the affects on the earths surface?
Sinkholes start developing a long time before they actually appear. The ground beneath our feet is not as much of a soil structure as we think it is. The ground is made from dirt, rocks and other minerals.
What causes a sinkhole?
What are the signs before a sink hole occurs?
A fast sinkhole caused by drilling or other sudden alterations to the land may not give any warning signs. Otherwise, the collapse process usually occurs gradually enough that a person may leave the affected area safely. The final breakthrough can develop over a period of a few minutes to a few hours.
Can Sinkholes be prevented?
Many natural sinkholes cannot be prevented. The ones that are naturally occurring are nearly unpredictable. However, those caused by human activity can be avoided, especially those caused by over-pumping groundwater. Unfortunately it is impossible to prevent all sinkholes.
Where do sink holes occur?
Sinkholes most commonly occur in Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania. The most common state for sinkholes to occur is in Florida with almost 6,700 claims of sink holes occuring in 2010.
Why do sinkholes occur most commonly in Florida?
Florida peninsula (fore-land) is made up of rocks such as limestone that store and help move groundwater. Dirt, sand and clay sit on top of the rock. Over time, these rocks can dissolve fgreating a voi beneath the limestone. When the dirt, clay or sand gets too heavy for the limestone roof, it can collapse and form a sinkhole. Sinkholes are caused naturally but they can be triggered by outside events.
How much damage do sinkholes do?
The state Office of Insurance Regulation says sinkhole claims in Florida cost insurers
$1.4 billion from 2006 to 2010.
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