Write a short note on active volcanoes and write two examples
Answers
Answer:
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava ... Volcanoes are usually not created where two tectonic plates slide past one another. ... Very good examples of this type of volcano can be seen in Iceland, however, there are also tuyas in British Columbia
Explanation:
Answer:
Popular classification of volcanoes
A popular way of classifying magmatic volcanoes is by their frequency of eruption, with those that erupt regularly called active, those that have erupted in historical times but are now quiet called dormant or inactive, and those that have not erupted in historical times called extinct. However, these popular classifications—extinct in particular—are practically meaningless to scientists. They use classifications which refer to a particular volcano's formative and eruptive processes and resulting shapes.
Explanation:
Scientists usually consider a volcano to be erupting or likely to erupt if it is currently erupting, or showing signs of unrest such as unusual earthquake activity or significant new gas emissions. Most scientists consider a volcano active if it has erupted in the last 10,000 years (Holocene times)—the Smithsonian Global Volcanism Program uses this definition of active. Most volcanoes are situated on the Pacific Ring of Fire.[12] An estimated 500 million people live near active volcanoes.[12]
Historical time (or recorded history) is another timeframe for active.[13][14] The Catalogue of the Active Volcanoes of the World, published by the International Association of Volcanology, uses this definition, by which there are more than 500 active volcanoes.However, the span of recorded history differs from region to region. In China and the Mediterranean, it reaches back nearly 3,000 years, but in the Pacific Northwest of the United States and Canada, it reaches back less than 300 years, and in Hawaii and New Zealand, only around 200 years.