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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Professor Radcliffe Geology 1 Lab Report December 10‚ 2012 Geology of the Caribbean Islands Have you ever wondered how the famous tropical land masses located in Central America‚ known as the Caribbean Islands‚ came to existence? Well geologists have dated some of the rocks in the islands such as‚ Cuba and Trinidad‚ as far back as the Jurassic time period. This means the rocks formed about 145-200 million years ago‚ therefore the eldest islands from the Caribbean date way back to the time
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Chapter 1: An Introduction to Geology What is geology‚ and what is the difference between physical and historical geology? Geology is the scientific study of the Earth and its major systems Physical Geology is the Study of the Earth’s composition. structure‚ and the processing that shape it Historical Geology is the Study of Earth’s history and the history of life With respect to why we study geology‚ in class I cited three areas of benefit to humanity where geologic knowledge is needed. What
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moor‚ among others. Sill: A tabular sheet intrusion where magma has intruded between older layers of sedimentary rock‚ beds of volcanic lava or tuff‚ or even along the direction of foliation in metamorphic rock. Good examples are the Salisbury crags in Edinburgh‚ which are formed by a sill partially exposed by the ice age. Dyke: Similar to a sill‚ except the lava has intruded along cracks and faults in one particular rock type. It cuts across layers‚ or through one layer or an unlayered rock‚ rather
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as a hill or a mountain that is constructed by the extrusion of lava or rock fragments from a vent (Plummer‚ 2007). A volcano consists of a volcanic cone‚ craters‚ vents‚ necks and fissures within its physical form. But volcanoes have more to them that isn’t seen so easy from a distance‚ volcanoes also consist of magma and lava. Magma is the molten rock and trapped gasses that are found beneath the Earth’s surface. Lava is the molten rock that is found on or above the Earth’s surface
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It has had 33 eruptions and in most of the eruptions‚ an earthquake has preceded the eruption. The most famous eruptions occurred in 1950 and 1984. On June 1‚ 1950‚ lava erupted from a 20 km long fissure along the middle portion of the rift zone. The lava
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Volcanoes are generally not preserved in the geologic rock record as they are usually eroded away. However‚ the various materials erupted from volcanoes are often found preserved in the rock record. From what you have learned about the different types of volcanoes‚ how could you infer what type of volcano erupted in a given area based on the type of volcanic deposits now found as layers of rock? Give specific examples‚ and briefly discuss how some materials may be linked to different types of volcanoes
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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 is located on the island of silicon‚
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Volcanoes on a destructive plate margin often lie dormant for years but have explosive and violent eruptions with acidic lava‚ pyroclastic flows and copious amounts of ash. Because of the length of time that they lie dormant prediction isn’t as easy. Montserrat in the Caribbean experienced a violent eruption in the mid 1990’s. The early activity showed signs of a major eruption
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years (rough estimate at best)‚ Mt. Saint Helen’s is the most active volcano of the Cascade Mount Range. With its last eruption between the years of 2004-2008 where 92 million cubic meters erupted from the lava dome. (USGS 2004). There are several hazards associated with Mt. Saint Hellen’s. Lava domes‚ lahars‚ pyroclastic flows‚
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