The most abundant volcanic gas is water vapour (H2O). Carbon dioxide (Co,) and Sulpher dioxide (So,) are two other important gases present in a volcanic eruption. A significant amount of Hydrogen sulphide (H,S), Hydrogen (H.), Carbon mono oxide (CO), Hydrogen chloride (HCI), Hydrogen fluoride (HF) and Helium (He) gas is also found in it.

The world's smallest active volcano is probably Mount Taal, located near the city of Tagaytay in the Philippines. It is a positively gargantuan 508 meters (1,660 feet) high, more than thirty-nine times the height of Cuexcomate, its Lilliputian cousin.

Magma is a molten and semi-molten rock mixture found under the surface of Earth. Magma is a very fluid and dynamic substance having a temperature between 600c to 1200c. When Magma is ejected by a volcano, the material is called Lava. Magma on cooling converts into a solid known as igneous rocks. On the basis of silica's concentration lava is of two type (1) Acidic lava. It contains a large amount of Silica, highly viscous. (2) Basic lava. It contains a small amount of silica and is highly fluid.

The volcanic eruption is related to Plate's edges in the convergence and divergence area. In the given option, the Baltic Sea is not related to plate's edge, thus, it is clear that the volcanic eruption does not occur in the Baltic Sea.

Mount Etna is an active volcano on the East-coast of Sicily, Italy. It has an elliptical base of 1190 sq km. and its maximum height is about 3350 meter.

Mount Saint Helens is an active strato volcano located in Skamania county, Washington in the Pacific North West Region of United States of America. It is also known as the Fuji of America'.

In Hawaiian language Manuna Loa means the Long Mountain It is one of the active volcanoes Mauna Loa had its first eruption in 1843 It is spread over half of the Hawii island (USA) with a length of 120 km.

Cotopaxi Etna and Fujiyama are active volcanoes while Aconcagua is non volcanic mountain Cotapaxi is situated in Ecuador Etna in Italy and Fujiyama in Japan.

Kilimanjaro is a dormant volcano situated in Tanzania and Aconcagua is a non volcanic mountain. The other two are active volcanoes. Vesuvius is situated at (Naples), Etna in Sicily, Italy.

Stromboli is one of the most active volcano on the earth located at the island of stromboli, north to Sicily, southern Italy. Due to the continuous gaseous eruption, it enlightens the nearby area. Therefore it is known as 'lighthouse of the Mediterranean.