A volcano is a region on the Earth’s surface where hot lava, gases and volcanic ash erupt through the earth’s crust. Literally, the word volcano comes from the name of the Roman God of Fire, Vulcan. These volcanoes exist on the Earth because its crust is divided into 17 solid tectonic plates which float on extremely hot and soft layer in the Earth’s mantle. Hence, on this planet, volcanoes are usually found where tectonic plates are diverging or converging.
Hawaii’s Mauna Loa is the largest volcano on this planet. Mt. St Helens in USA is the most active volcano. Olympus Mons on the planet Mars is the largest volcano in the Solar System.
Types of Volcanoes
The volcanoes are classified on the basis of their frequency of eruption.
Effects of Volcanoes
All these volcanic eruptions can cause hazard to human life, as these activities are accompanied by earthquakes, hot springs, geysers and mud pots. In 1815 AD, the eruption of Mount Tambora leads to global climate abnormalities popularly known as the “Year Without a Summer”. As a result of this volcanic activity, agricultural crops and livestock died in most of the regions of the Northern Hemisphere. This is the considered the worst famines of the 19th century.