How was Indonesia formed?
The Indonesian archipel- ago formed over the past 300 million years by reassembly of fragments rifted from the Gondwana supercontinent that arrived at the Eurasian subduction margin. The present-day geology of Indonesia is broadly the result of Cenozoic subduction and collision at this margin.
How the volcanoes were formed?
A volcano is formed when hot molten rock, ash and gases escape from an opening in the Earth’s surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape shown here. As a volcano erupts, it spills lava that flows downslope. Hot ash and gases are thrown into the air.
Why Indonesia have a lot of volcanoes?
Indonesia is the country that contains the most active volcanoes of all countries in the world. The Eurasian Plate, Pacific Plate and Indo-Australian Plate are three active tectonic plates that cause the subduction zones that form these volcanoes.
How many volcanoes are there in Indonesia?
It can be said that Indonesia is a country having the most active volcanoes in the world. Indonesia has a great number of volcanoes in the world. There are 147 volcanoes, and 76 of them are the active volcanoes and spread along the islands of Sumatra, Java, Celebes, and Lesser Sunda (Figure 1).
How do volcanoes formed what are the two main processes?
Volcanoes are formed when magma from within the Earth’s upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
Is Indonesia in the Ring of Fire?
Indonesia is the country of Ring of Fire volcanic belt and holding about 40% of the world’s geothermal reserves. More than 200 volcanoes are located along Sumatra, Java, Bali and the islands of eastern part of Indonesia, which is known as The Ring of Fire.
Are volcanic eruptions common in Indonesia?
Indonesia is a volcanically active country, containing numerous major volcanoes. It has the most volcanoes of any country in the world, with 76 volcanoes that have erupted at least 1,171 times in total within historical times. The Smithsonian Institution has 141 Indonesian entries in its volcano database.