How old is the oldest active volcano

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Learn more about your data on Quizzclub. OK Set preferences. What is the oldest active volcano on Earth? May 8, PM. Vimala Padmaraj. Mar 12, AM. Roselyn L Prollo. The explosions are usually first because there are lots of gases inside the magma. When you have a bottle of soda pop, you do not see any bubbles of gas, but when you open it, bubbles form almost instantly. Once the gas bubbles have all escaped, the soda is flat. Once the magma is flat, a lava flow comes out.

Most of the volcanoes from around the Pacific Ocean are composite, which means that there are layers of ashes and lava. Most volcanoes are 10, to , years old — it takes time for them to grow big. What gases do volcanoes emit? Inside the crater of a volcano there is nothing alive and many small fumaroles holes release nasty gases. There are many colorful minerals being deposited from the gases as they cool. The most important gas is water, and then carbon dioxide.

These two important gases are not poisonous. Sulfur dioxide, hydrogen chloride, and hydrogen fluoride are emitted, as well. They are strong poisons and cause pollution problems. What kinds of rocks do volcanoes make? Volcanoes make many different types of rocks.

For example, black shiny rocks with only a few crystals are usually basalt. The opposite — white shiny rock with many crystals and often many bubble holes inside the rock is rhyolite. In between are andesites, which are light gray and usually have large box-shaped crystals called plagioclase. They come from the Andes Mountains, which is a chain of volcanoes in South America. The Hawaiian islands are mostly made up of basalts, so they are famous for their beautiful black-sand beaches.

How many volcanoes have been identified in the world? We know of at least 1, active volcanoes around the world. That is a big increase from the number that we used to think was correct. It means that more people are searching the earth for them. A graph of the number of volcanoes of the world shows that it goes up just about as fast as the number of people on the earth does. What country has the most volcanoes? Indonesia has the most volcanoes, by far.

It is really a special place because there seem to be volcanoes all around, in all directions. Merapi which means "mountain of fire" erupted in January and killed a few hundred people. How many volcanoes are there in the United States? The lower 48 states in the U. In Alaska, the number is more like When we talk about whether a volcano is active or potentially a threat, it is important to look at the past ten years.

Most of the important eruptions and disasters have happened at mountains that were not even recognized as being volcanoes, for example Pinatubo Philippines, , El Chichon Mexico, , Arenal Costa Rica, Eruptions are listed below sorted with the longest at the top. Global Volcanism Program, Volcanoes of the World, v. Venzke, E ed. Smithsonian Institution. Downloaded 11 Nov What volcanoes have had the longest eruptions?