Explanation: The Andaman and Nicobar Islands are a union territory of India, located in the Bay of Bengal. This archipelago consists of 572 islands, of which only 38 are inhabited. Among these islands, Barren Island stands out due to its geological significance. Barren Island is the site of India's only active volcano, which has been active for several decades, with the most recent eruption occurring in 2017.
The volcano on Barren Island is a stratovolcano, which is a conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. The island itself is relatively small, covering an area of about 3.6 square kilometers. The volcano's summit reaches an elevation of approximately 354 meters above sea level.
The presence of an active volcano on Barren Island is a result of the complex tectonic activity in the region. The Andaman and Nicobar Islands are located on the boundary between the Indian Plate and the Burma Plate, which is part of the larger Indo-Australian Plate. This tectonic setting is conducive to volcanic activity, as the movement and interaction of these plates can lead to the formation of magma chambers and subsequent volcanic eruptions.
It is important to note that while Barren Island is the only active volcano in India, there are other dormant and extinct volcanoes in the country, such as the Deccan Traps in Maharashtra, which are the result of massive volcanic eruptions that occurred millions of years ago. However, these are not currently active.
Understanding the geographical features of the Andaman and Nicobar Islands, including the presence of an active volcano, is crucial for students of geography and those preparing for competitive examinations that cover Indian geography. This knowledge not only highlights the unique geological features of the region but also underscores the importance of monitoring and studying volcanic activity for safety and scientific research.