A volcano is a vent on the Earth's crust, through which hot and molten rock―also known as lava or magma―comes out. Volcanoes are usually found in places where the tectonic plates are constantly moving. It begins as small vent and as the lava cools down and solidifies, it forms a cone around the vent.
Interesting Facts about Volcanoes
Mount Vesuvius, located on the coast of the Bay of Naples in Europe, is considered one of the most dangerous volcanoes in the world. Its eruption in 79 AD killed around 20,000 to 25,000 people, and destroyed two major European cities, Herculaneum and Pompeii.
The amount of ash produced during the eruption of Tambora―a volcano in Indonesia―in 1815 brought about drastic climatic change. The temperature all over the world dropped down. In August 1816, New England in USA experienced severe frosts.
The sound produced by an eruption on the island of Krakatoa―a volcanic island located between Java and Sumatra in Indonesia―in 1883 was so loud that even the people of Australia heard it. This was the loudest sound to be heard in the history of mankind.