"Lava" Essays and Research Papers

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Heimaey. The town was mostly evacuated over the next few days and the lava slowly flowed towards town and the mouth of the harbor for the next seven months. Vestmannaeyjar is the only good harbour in that part of Iceland, and was the base for a large fishing fleet that produces a significant part of Iceland’s GNP. As the lava threatened to overrun the town and close off the harbor, a decision was made to try to slow and divert the lava by cooling it with sea water. The idea was initially scoffed at, but...

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Volcanoes Are Big Erupting Mounting That Shoot Out Hot Lava

 Volcanoes are big erupting mounting that shoot out hot lava/magma. Volcano eruptions produce a lot of toxic gases which can damage the environment. When a volcano is about to erupt there is rain, thunder, and lightning. Volcanoes can also be bigger or smaller than a mountain. There are many different types of volcanoes that cause destruction throughout the entire world. Volcanoes occur all over the world anytime of the day. Volcanoes occur at the mid-ocean ridges because they are divergent...

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Why Are Some Volcanoes More Hazardous Than Others

in the magma. These factors produce 2 main types of magma called acid and basic. The acid lava is the more viscous (66%+ rich silica) and so this is the more hazardous lava as it has more potential for explosion. The other, less viscous lava is the basic lava which has a 44-52% silica content and has a higher temperature of 1000-2000 degrees compared to the 600-1000 of the acid lava which allows the basic lava to run more smoothly and more fluid like. Most volcanoes occur at a plate margin because...

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Disadvantages: Sea - during a volcanic eruption earthquakes happen, and tsunamis may be created. Also, if it is a volcanic island, the island may be destroyed, and there is no escape. Lava flow - these are very slow moving, but destructive as they cannot be stopped and they set fire to everything in their path. Pyroclastic flow - these are impossible to outrun, travelling at about 300 km/h, and are extremely destructive Mudflow/lahar - these are mud rivers that have the consistency of cement...

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Mt Etna

explosive eruptions sometimes with minor lava flows, usually from one or more of the three main summit craters 2. Flank vents with higher lava flow rates – these are less frequently active and originate from fissures that open down from the summit 2001 eruption causes: complex flank eruption where all four summit craters produced spectacular and powerful activity, ranging from mild, persistent, slow (strombolian) activity, to high-energy explosive episodes. Lava flowed from all four summit craters as...

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Module 2

and hornblende with some quartz or biotite d. particles of volcanic ash welded together 4. When mafic lava breaks through fissures in the continental crust, which of the following often results? a. lava plateaus b. composite volcanoes c. lava domes d. pyroclastic sheets 5. Which scenario is associated with mafic magma? a. hot, fluid lava that forms a shield volcano b. hot, fluid lava that forms a stratovolcano c. an explosive eruption that ejects pyroclastic materials d. cool, viscous...

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Active Earth- Jacaranda- Answers

constantly moving and may crash into each other or slide or move apart from each other. Continental Plate: Large sections of the surface of the Earth that move separately. Shield Volcano: Volcanoes formed by viscous lava and have broad and flat sides. This happens due to the lava cooling slowly which lets it spread widely before cooling. Magma: Molten or partly molten rock underneath the Earth’s surface. Seismic Activity: Release of energy from the focus of an earthquake that spread outwards...

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Three Main Types Of VolcanoesThe Three

Explosive Diamond Cinder Cone, Washington County Shield Volcano Very gentle slopes; convex upward (shaped like a warrior’s shield) Large over 10s of kms across fluid lava flows (basalt) Quiet Cedar Hill, Box Elder County Strato Volcano Gentle lower slopes, but steep upper slopes; concave upward Large 1-10 km in diameter numerous layers of lava and pyroclastics Explosive Mount Belknap, Tushar Mountains, Paiute County Active Volcanoes A volcano will be classified as an active volcano if at the...

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surrounding and supportive information. In the war ridden country of Africa’s Democratic Republic of the Congo lays Nyiragongo. Nyiragongo, one of the world’s most active volcanoes, is classified as a stratovolcano. It is composed of alternate layers of lava and ash. A group of scientists repelled into the crater to get a better examination and understanding of the volcano. Their intentions in examining it were to determine, or at least attempt to determine, when the next eruption could occur. Nyiragongo...

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Geology Chapter 5

different kinds of material that can erupt from a volcano. Products of eruption come in three forms; lave flow, which can be Basaltic, Andesitic or Rhyolitic lava. A volcano also erupts pyroclastic debris (when lava flies into the air and freezes) and gases. 2. Contrast a pyroclastic flow with a lahar. Pyroglastic debris are blasting clots of lava, and the lahar are like mudslides that can reach up to 50km per hour. When the lahar stops moving it creates a layer of volcanic depris, (which can contribute...

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