Volcanoes occur when two tectonic plates collide or‚ when there is a hot spot in the crust and constructive forces build a volcano. There are two types of volcanic flows pyroclastic and mud flows. Pyroclastic volcanoes occur when the amount of magma in the chamber collects and the pressure increases causing the volcano to erupt. Mud flows are kind of like pyroclastic accept the lava in the chamber doesn’t collect and cause an eruption it just flows out the top of the volcano. Mount Etna
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mid-ocean ridge with that of igneous rock found farther away from the ridge. The ages of the igneous rock found near the mid-ocean ridge was younger than the igneous rock found farther away from the ridge. This is because of convection currents. Magma rises because it is less dense. It is forced out of the ridge‚ it spreads apart‚ and when it cools‚ it becomes new seafloor. This is why newer seafloor (igneous rock) is younger when it is closer to the ridge. 2. If the distance from a point on the
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spread. This is due to the viscosity of the lava being extremely high. One of the most famous stratovolcanoes is Mount Vesuvius. This volcano is known for its huge explosion that had taken out the whole town of Pompeii. When a stratovolcano erupts the magma chamber builds up until the volcano explodes. Thus causing major destruction‚ including‚ ash fall‚ huge lava flows and
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Big Bend National Park Report 1. What is the depositional nature of the rocks in the study area and how does their lithologic compositions and sedimentary structures record changing water depths‚ environments of deposition‚ and paleogeography? Big bend national park has complex rocks that are subsided in two seas hundreds of millions of years ago. Fossil data from the mid to Upper Cretaceous period predicts the sequence of rock strata in Big Bend National Park to be from bottom to top: limestone
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CINDER CONE VOLCANO The cinder cone volcano‚ commonly found in volcanic areas‚ are constructed of rocks and ashes. Gas created from the lava is blown into the air which then “cools and solidifies as small rocks or cinders”. Cinder cone eruptions “take place in basaltic volcanic fields” that immensely effect the human population surrounded by it. Cinder cone eruptions majorly impact the environment by distributing volcanic gases‚ volcanic landslides and blasting tephra. One of the long-term impacts
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Name: Kelcie Jolliffe Date: November 17th‚ 2014 Graded Assignment Lab Report Answer the questions below. When you are finished‚ submit this assignment to your teacher by the due date for full credit. In this laboratory experiment‚ you will write a narrative history of a rock section found in the Grand Canyon. You will describe and explain the events starting with the Vishnu Schist forming and ending with the unconformity above the Redwall Limestone in the Mississippian. Your description should include
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eruption in Montserrat was due to subduction‚ but the Atlantic tectonic plate subducts beneath the Caribbean plate. Mt St Helens went on to erupt in a Plinean style‚ spewing out ash and produce pyroclastic flows -currents of hot gas and ash. The magma burst out causing large pyroclastic flow flattening vegetation and buildings for over 230 square miles (600 km²). There were volcanic Mudflows- Due to collapse of northern side mixed with ice‚ snow and water. These flowed many miles down the Toutle
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Dear Principal‚ I really would like to visit Lava Beds National monument located in northeastern California. It holds many new learning experiences‚ many new sights to see‚ and possibly might change their career. A surreal landscape sculpted by molten earth‚ Lava Beds National Monument contains volcanic tablelands punctuated by cinder cones and spatter cones‚ plus more than 700 caves. These strange features were formed when the outer edges of flowing lava began to cool‚ forming tubes. When
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Mount Saint Helen’s Volcano‚ part of the cascade mount range‚ is associated with the subduction zone of the Juan du Fuca plate into the North American plate‚ as is most of the volcanism in this mount range (USGS Geology & History). The eruption intensity is normally quite explosive but Mt. Saint Hellen’s has experienced the peaceful one on occasion (USGS Geology & History). With frequent eruption every couple hundred years (rough estimate at best)‚ Mt. Saint Helen’s is the most active volcano of
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Hornfels DEFINITION Hornfels is a very fine-grained metamorphosed shale rock‚ usually gray to black in color. Mineral composition in variable but is usually made up of some combination of equidimensional mosaic of quartz or calcite along with inequidimensional sheet silicates in random orientation or sometimes containing andalusite porphyroblasts. OCCURANCE Hornfels forms when shale rocks come into contact with a hot igneous intrusion body at lower pressures and at the equilibrium temperature
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