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Sinkholes

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by

Elizabeth Harris

on 27 November 2015

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Transcript of Sinkholes

Questions
1. Where are the most common sink holes?
2. What types of bedrock are most susceptible to sinkholes?
3. What pre - disasters happen before a sinkhole?
4. How are Sinkholes formed both man made and naturally?
5. How does the Earth change because of a sinkhole?
Where are the most common sinkholes?
According to the USGS, approximately 20% of U.S land is susceptible to sinkholes. The most damage occurred by sink holes tends to happen in Florida, Texas, Alabama, Missouri, Kentucky, Tennessee and Pennyslvania.
What types of bedrock are most susceptible to sinkholes?
Areas that have a bedrock made of limestone, salt deposits or carbonated rock are most susceptible to erosion and the forming of sinkholes. These rocks tend to erode as acid water passes through them. When rainwater passes through, decomposing of plant debris tends to become more acidic. Over the years, pieces of the ground collapse and a sinkhole develops.
How are sinkholes formed both man made and naturally?
Naturally
The ground is made from dirt, along with many rocks and minerals. There is water continually seeping in between the mud, rocks and minerals, as it makes its way down to the ground water reservoirs. As this happens, the water slowly erodes the rocks and minerals. Sometimes the flow of water increases to a point when it washes away the underground structure of the land. And when the structure becomes too weak to support the surface of the earth, it collapses and opens up a hole.
How does the Earth change because of a sinkhole?
When they are formed on land, they can change the general area and divide streams of underground water. If they form suddenly in areas with heavy population, they can cause a lot of damage to human life and property. When they collapse, the damage can be seen for many miles due to the repairs that become necessary.
What pre -disasters happen before a sinkhole?
Before a sink hole forms, the pre-disasters include heavy rain, followed by a drought, then more heavy rain and then storms.
Sinkholes
Man Made
Things like drilling, mining, construction, broken water/drain pipes or even heavy traffic can result in small to large sinkholes. Water from broken pipes can go through mud and rocks and erode the ground underneath and cause sinkholes. Sometimes, heavy weight on soft soil can result in collapse of ground, resulting in a sinkhole.
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