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volcanoe

volcanoes

QuestionAnswer
Volcano A weak spot in the crust where magma comes to the surface
Magma Mixture of melted rock and gases
Lava magma when it reaches the surface
Ring of fire major volcanic area formed by many volcanoes around the Pacific Ocean
Volcanoes on diverging plate bounderies volcanoes form along a mid-ocean ridge
Island arc a string of islands created by converging plates when one plate is pushed under another.
Hot spot volcanoes an area no where near a plate boundary where magma melts through the crust.
viscosity of magma magma can either be thin and runny (low viscosity) or thick and chunky (high viscosity) The more silica ( silicon + oxygen) magma contains, the thicker it is
types of volcanic eruptions eruptions can be quiet or explosive depending on the volcanoes magma
quiet thin , runny lava oozes quietly from a vent Pahoehoe-which is fast moving, thin lava aa-which is slower, thicker, cooler lava
explosive volcanic eruptios magma is thick and sticky magma becomes trapped in volcanoes pipe, pressure builds this creates bombs,ash,and lava called a pyroclastic flow
stages of a volcano active is a volcano that is erupting or shoes signs that it may erupt in the near future dormat, or sleeping volcano may become active extict, or dead volcano is unlikely to erupt again
other types of volcanic activity hot springs forms
explosive volcanic eruptios magma is thick and sticky magma becomes trapped in volcanoes pipe, pressure builds this creates bombs,ash,and lava called a pyroclastic flow
stages of a volcano active is a volcano that is erupting or shoes signs that it may erupt in the near future dormat, or sleeping volcano may become active extict, or dead volcano is unlikely to erupt again
other types of volcanic activity hot springs forms when groundwater heated by magma rises to the surface and collects in a natural pool Geyser is a fountain of water and steam that erupts from the ground
Created by: 15rvingelli