Question

Write a summary or make notes of the following passage. Volcanoes is a vent in the earth's crust having funnel shaped hollow from which eruption or flow of hot materials called lava takes place. It is caused by magma forcing its way to the earth's surface. Before the flow of lava, rock fragments and ashes are also thrown out into the air. When the lava ejected by a volcano is thick it goes on accumulating round the vent and forms a conical hil. With further accumulations of lava. In this way, it forms a high mountain called a volcanic mountain. The mouth of the volcano which looks like a bowl is known as a crater. When a volcano remains inactive for a long period, the rain water accumulate in the crater, and forms a lake called a crater lake. Sometimes lava comes out through deep fissures. This type of lava ejection is called fissure eruption. Some volcanoes emit lava, ashes, steam, gases etc. frequently. They are called active volcanoes. The Barren island volcano in the Andaman islands, Etna in Sicily and Stromboli in the Mediterranean sea are good examples. There are about 450 active volcanoes in the world. Volcanoes that have remained inactive for quite a long period are sleeping or dormant volcanoes. Such volcanoes are very dangerous because they suddenly rise to activity. Vesuvius near Naples in Italy is the example of this type of volcano.??​

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