Why do volcanoes erupt?

Many natural disasters have occurred on the earth over a long period of time and volcano eruption is one of them. Many years ago, a lot of eruptions took place through which a lot of lands, mountains, lakes and terraces had formed on the earth. It is no wonder that volcanoes cause a lot of disasters because of their huge hot flames. In the past 10,000 years around 6000 volcanoes had erupted. Among them only ¼ th part of the volcanoes seemed to be active inside the earth. According to scientific research, the first eruption took place in Indonesia around 70,000 years ago.and because of it the earth froze with cold for about 6 years.  

In this video, the journalist has provided a report about the pros and cons of the volcano eruption. He is talking about whether the eruption is always harmful or does it also cause some good effects on the earth. Volcano is a rupture in the crust of a planetary-mass object, such as Earth which allows hot volcanic ash, lava and different gases to escape from a magma chamber below the surface. The upper surface objects of the earth are slowly passed down inside the earth and after very long years it reaches inside the inner core of the earth and gets melted and forms the hot liquid lava. When the lava gets too hot then by making the way it tries to come above the earth surface and in a very long period of time the lava comes out of the earth surface causing the volcano eruption. There are different types of volcanic eruptions and they are divided as Shield volcanoes, Cinder cones, Composite volcano and Caldera.

First of all let’s talk about Shield volcano. It is that type of volcano which passes through the slope and is explored to a larger extent. When it erupts, the lava from it travels to the high earth atmosphere.

Second one is Cinder cones, which are small in size when compared with Shield volcano and hold a huge amount of hot ashes but the lava is small.

Third one is the Composite volcano which is in cone shape and consists of a big hole in the middle of it. From the hole different components like-lava, ashes, baluwa explored out.