Magma Chamber – A magma chamber is a large underground pool of molten rock sitting underneath the Earth’s crust. This magma is less dense than the surrounding mantle and so it seeps up to the surface through cracks and flaws in the crust. When it reaches the surface‚ it results in a volcanic eruption. Lava – Lava is the rock expelled from a volcano during an eruption. When it first comes out‚ the lava can have a temperature higher than 700 degrees C. It then flows downhill from the eruption point
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around the volcano * * * * * Salt Dome and Salt GlaciersSalt is Ductile * Caldera Caldera Caldera (huge pits in the ground caused by volcanic eruptions) * Check for lava rocks near the happening * Magma Chamber Magma Chamber January 10‚ 2013 Lecture Notes Tectonic Plates * They float (lower density * They move at a rate of cm/ year * Plate tectonics deform continents when they collide with other continents Continental Crust: 2.7 g/cm
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Crater Lake partially fills a type of volcanic dejection called a caldera that formed by the collapse of a volcano identified as Mount Mazama during an colossal eruption approximately 7‚700 years ago. Located on the Cascade- Sierra Mountains Plateau area of southern Oregon‚ “Mount Mazama is one of the major volcanoes of the Cascades Arc” (USGS) that extends from northern California to British Columbia. the devastating eruption of Mount Mazama altered the landscape all around the volcano. Pyroclastic
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Geo assessment Mt Etna An eruption begins when pressure on a magma chamber forces magma up through the conduit and out the volcano’s vents. When the magma chamber has been completely filled‚ the pressure in the pipe will build up very high resulting in an explosion. When magma reaches earth’s surface it is called lava. It may pour out in gentle streams called lava flows or erupt violently into the air. Rocks ripped loose from the inside of the volcano or torn apart by the gas may be shot into the
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an andesitic magma and you will get? -A more felsic residual melt 4. Which of the following types of volcanoes is typically the largest in terms of overall volume? -Shield Volcano 5. What minerals are involved in the continuous part of Bowen’s Reaction Series? -Plagioclase Feldspar 6. Which of the following minerals (as shown by their chemical formulae) has a neutral (zero) charge given that Si= +4‚ Al= +3‚ Ca= +2‚ O= -2? -CaSi2Al2O8 7. The differentiation of magmas due to removal
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the flow of the magma and for the landward side the magma originated from the subduction zone. This zone has magma that are of high viscosity‚ they are granitic-andesitic and excrude at 700-9000c‚ have thick short flows that has slaggy surface‚ they cover large distance at slow pace to be specific 10m/hr on flat surface and 100m/hr on slopes. They are said to be explosive because they have ash associated with the eruptions as well as being acidic at times. With this type of magma a variety of eruptions
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divergent plates. It is the Afar rift that is causing the volcano to continue to be active today. The two plates that are responsible for this are the Nubian and the Somalian plates. Considering this is an active volcano‚ it does produce slow moving magma. The volcano doesn’t have a huge eruption it is small and builds up in the crater and causes a lava lake. The volcano we modeled was relatively small. We were able to keep the volcano model small because of it. We used installation foam to form the
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clouds of dust erupting from Vulcano came from Vulcan’s forge as he beat out thunderbolts for Jupiter‚ king of the gods‚ and weapons for Mars‚ the god of war. 2. What is the difference between magma and lava? •Molten rock below the surface of the Earth that rises in volcanic vents is known as magma‚ but after it erupts from a volcano it is called lava 3. What are the main types of volcanoes? •cinder cones‚ composite volcanoes‚ shield volcanoes‚ and lava domes. 4. The Hawaiian Islands
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Energy Source of Natural Hazards Disasters occur where and when the earth’s natural processes concentrate energy and then release it‚ killing and causing destruction. Four energy sources make the earth an active body: 1) the Earth’s internal energy; 2) solar energy; 3)gravity; 4)the impact of extraterrestrial bodies The interior of the Earth holds a tremendous store of heat released primarily from the ongoing decay of radioactive elements. Earth’s internal energy flows unceasingly toward the
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INTRODUCTION. Diorite is an igneous rock formed from the partial melting of the crust caused from by basaltic magma from the mantle. It is associated with batholiths‚ dikes and stocks usually around volcanic arcs. Its volcanic equivalent is andesite which is formed from strombolian type volcanoes. DISCUSSION Physical properties: Diorite is a phaneritic rock that is speckled black and white/grey with a very variable colour index of between 40 and 90 over short distances. The rock has an equigranular
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