LESSON 06 Why Sinkholes Open Up
YBM 시사영어 고등 교과서 영어1 한상호 6과 본문 음원입니다.
Sinkholes can form underwater, too.
Underwater sinkholes are called blue holes.
The Great Blue Hole in Belize is one of the most spectacular; it is 300 meters wide and 124 meters deep.
Sinkholes typically occur in areas where the rock beneath the surface soil is limestone, carbonate rock, sandstone, or some other soft rock that is easily worn away by water.
These kinds of rocks are found in many parts of Florida, Texas, and Kentucky in the U.S.
They are also common in the U.K., Mexico, Belize, Slovenia, Croatia, and China.
When rainwater seeps down through surface soil, it eventually reaches the bedrock below.
Slowly and continually, sometimes over hundreds or thousands of years, the water erodes small parts of the rock, creating cracks underground.
As the process continues, the soil above is gradually washed into the cracks, and it creates a space in the soil.
It is not seen on the surface.
As the space becomes too large to support the soil above, it collapses, and a hole opens up on the surface.
Though sinkholes form gradually, the final collapse of the surface happens suddenly.
'영어 1 > 영어1 시사 한상호' 카테고리의 다른 글
| 영어1 시사 한상호 6과 본문 mp3 Why Sinkholes Open Up - 4 (0) | 2021.05.23 |
|---|---|
| 고등영어1 시사 한상호 6과 본문 mp3 Why Sinkholes Open Up - 3 (0) | 2021.05.22 |
| 고2 영어 시사 한상호 6과 본문 음원 Why Sinkholes Open Up - 1 (0) | 2021.05.20 |
| 고등학교 영어1 시사 한상호 5과 본문 mp3 Lesson 05 How Potatoes Changed the World - 3 (0) | 2021.05.19 |
| 고2 시사 한상호 5과 본문 음원 How Potatoes Changed the World - 2 (0) | 2021.05.19 |
댓글