Common volcanic gases include water vapor, carbon dioxide, sulfur dioxide, hydrogen chloride, hydrogen fluoride and hydrogen sulfide. In an eruption, gases and Volcanoes are found on the ocean floor and even under ice caps, such as those found in Iceland.While we certainly have some big volcanoes here on Earth, the biggest known volcano in our solar system is actually on Mars. Its name is Olympus Mons and it measures a whooping 600km (373 miles) wide and 2km (3 miles) high. A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur.More than 80% of the earths surface is volcanic in origin. The seafloor and some mountains were formed by countless volcanic eruptions. Gaseous emissions from volcano formed the earths atmosphere.Mount Tambora, also called Mount Tambora, Indonesia Gunung Tambora, volcanic mountain on the northern coast of Sumbawa island, Indonesia, that in April 85 exploded in the largest volcanic eruption in recorded history. It is now 2,85 metres (9,354 feet) high, having lost much of its top in the
85 eruption. The volcano remains active; smaller eruptions took place in 880 and 967, and episodes of increased seismic activity occurred in 20, 202, and 203.
Tamboras catastrophic eruption began on April 5, 85, with small tremors and pyroclastic flows. A shattering blast blew the mountain apart on the evening of April 0. The blast, pyroclastic flows, and tsunamis that followed killed at least 0,000 islanders and destroyed the homes of 35,000 more. Before its eruption Mount Tambora was about 4,300 metres (4,000 feet) high. After the eruption ended, a caldera spanning some 6 km (3.7 miles) across remained.Many volcanologists regard the Mount Tambora eruption as the largest and most-destructive volcanic event in recorded history, expelling as much as 50 cubic km (roughly 36 cubic miles) of ash, pumice and other rock, and aerosolsincluding an estimated 60 megatons of sulfur into the atmosphere. As that material mixed with atmospheric gases, it prevented substantial amounts of sunlight from reaching Earths surface, eventually reducing the average global temperature by as much as 3 °C (5.4 °F).