Volcanoes - הבנת הנקרא | Psychometry Best

שאלה 1 מתוך 5

Volcanoes

A volcano is an opening in the surface of the Earth. Deep inside our planet, rocks are so hot that they melt. This melted rock, called magma, sometimes pushes up through weak places in the ground. When it reaches the surface, it is called lava. Most of the world's land volcanoes are in a long line around the Pacific Ocean known as the Ring of Fire.

Not all volcanoes are the same. Some erupt quietly, with lava flowing slowly down the sides of the mountain. People can usually move out of the way in time. Other volcanoes erupt with great force. They send clouds of hot ash, rock and gas high into the air. These eruptions are the most dangerous. The ash can block the sun for days and even change the weather far from the volcano.

Volcanoes have also created some of the most fertile soils in the world. Over many years, old lava and ash break down into rich earth. Farmers in places like Indonesia and Italy grow excellent fruit and vegetables on land that was once covered in lava.

Scientists called volcanologists study volcanoes so that people who live near them can be warned in time. They measure small earthquakes, gas levels and the shape of the ground. These signs often appear weeks or months before an eruption.

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