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TRANSCRIPT
Fissure Volcanoes
By: Sho Kitamura&
Rahquielle Jeter
What is a fissure volcano?
• It is a volcano that is a long crack(fissure) in the earth.
• Magma erupts from it, it usually explodes straight up in the air as lava fountains.
• These fissures may form as 2 tectonic plates diverge from each other.
The Eruption
• A vast amount of liquid lava shoots and spreads far and wide.
• It forms a pool of lava.• When it cools down and becomes flat.
Where? When? & How?
• Where: They appear at hotspots or at spreading ridges.
• When: A dome of lava rises to less than 10 kilometers under the surface of the earth.
• How: A fissure typically resides along a fault produced when tensional stress results in the subsidence of a block of rock.
After Eruption
• Drainback: When lava which has erupted returns to the ground by going into a crack or an erupted fissure.
Example of Fissure Volcano
• The Laki volcano in Iceland was one of the most notable fissure volcanoes around the world.
• On June 8th, 1783 the Laki volcano erupted with 130 craters, caused by groundwater interacting with rising Basalt magma.
• The Laki volcano in Iceland is currently dormant.
• The Laki volcano produced pahoehoe lava.
Questions
• 1: There is approximately 1500 active volcanoes in the world
• 2: It decreases global temperature because when volcanoes erupt the ash is blocking the heat from getting into the atmosphere enabling it to cool down.
• 3: It could increase it by not producing ash which wouldn’t stop the sun’s rays from getting into the atmosphere.