LESSON 06 Why Sinkholes Open Up
고등영어1 시사 한상호 6과 본문 음원자료입니다. 열공하세요~~
The most common factor that triggers a collapse is a change in underground water levels.
For example, during long periods of drought, underground water levels will fall.
When this happens, the space that was once supported by the water may become weaker and collapse.
Another trigger is a rapid increase in surface water.
A sudden heavy rain can add dramatically to the weight of the surface soil, making it too heavy for the space beneath to bear.
This, too, can bring about a collapse.
Sometimes the trigger can be man-made.
Most sinkholes we are seeing these days are indirectly related to human activities, such as drilling, mining, or construction.
They may also occur because of broken water pipes, heavy traffic, and the excessive use of groundwater.
Collapses from these man-made causes can have especially dramatic effects because they often occur in the middle of a street or in housing areas.
Recently, many sinkholes have opened up in urban areas around the world, sometimes resulting in tragic accidents.
In 2010, in Guatemala City, an area approximately 20 meters wide and 30 meters deep collapsed, swallowing a three story factory and killing 15 people.
The sinkhole was caused by the increase of surface water due to tropical storm Agatha and leakage from a local waste water pipe.
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