Lesson 7 Watch Out
The Power of Volcanoes
A Sudden Volcano
Working on a cornfield one day in 1943, farmers in Mexico found something surprising.
A volcano appeared overnight on a flat cornfield.
Residents watched the volcano grow over 100 meters tall within a week.
The volcano, called Paricutin, kept growing, and it finally stopped growing at 424 meters in 1952.
You may think volcanoes can be found only on Earth.
However, they have been discovered on other planets, too, such as Mars and Jupiter.
In fact, “Olympus Mons” on Mars is the largest known volcano in the solar system.
Its volume is about 100 times greater than that of Mauna Loa, the largest volcano on Earth.
Being very powerful and dangerous, volcanoes do harm to people in many ways.
Sometimes people get hurt, or they may lose their houses.
Crops may be destroyed, and air traffic can be threatened.
Volcanoes can also have serious effects on world weather.
A volcanic eruption shoots lots of ash and dust into the air, preventing some of the sunlight from reaching Earth and thus disturbing usual weather patterns.
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