• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Plate Margins - Related Hazards.

Extracts from this document...

Introduction

H/W Geography 19th-10-00 Through out evolution mankind has always been threatened by all sorts of "Natural Disasters". The main types I will be talking about are Volcanoes and Tsunami. There are many types of volcanoes all over the world. There are mainly five types of volcanoes and they are Fissure, Central, Shield, Surface Volcanoes and Plate Tectonics and Calderas volcanoes. Fissure volcanoes are mostly associated with oceanic ridges, but they also can occur on land. In some cases they had some spectacular results. They emit large quantities of very fluid material, which spreads out to cover large areas; successive eruptions build up Great Plains or plateaux. Today these fissure volcanoes are best seen in Iceland, which straddles the Mid-Atlantic Ridge. However fissure volcanism on land is most associated with the past, with the great plateaux to be found on most continents. Plateau basalt's, flood basalt's, or ignimbrites, as they are called have formed amongst others, the Deccan Plateau of west-central India, the Parana Basin of southern Brazil and the list can go on. ...read more.

Middle

Shield volcanoes are very large structures that can be tens of kilometres in diameters, they usually have gentle slopes generally less than 12 degrees, they are usually formed by hundreds of outpourings of fluid, basaltic lava. These volcanoes usually have more than one vent. One can find the best place to find examples of these are along the Hawaiian Islands. The next type is about surface volcanoes, which are often associated with the destructive boundaries formed by tectonic plates, which are moving together. When two plates converge, the leading edge of one plunge's beneath that of the other towards the mantle, the semi-molten layer that underlies the lithosphere, the other continental crust. The earth's subduction zones lie mainly around the edge of the Pacific Ocean, and so do more than 3/4 of active, dormant or extinct surface volcanoes. They form a belt known as the "Ring of Fire", along which earthquakes are also common. The final type of volcano is the Calderas which is basically the crater through which the volcanic material emerges often remains as a depression even when the volcano is dormant, the result is lava sinks back into the volcanic vent. ...read more.

Conclusion

By the time it reaches the shore, it may become a towering wall of water 15 m (50 ft) high or more, capable of destroying entire coastal settlements. Tsunamis have erroneously been called tidal waves, but they have nothing to do with the diurnal pattern of high and low tides. Such waves, however, in combination with meteorological phenomena, can also sometimes be destructive and an example of this happened on a Caribbean island. Charlestown (St Kitts and Nevis), Nevis Island, St Kitts and Nevis, eastern Caribbean. Charlestown is the main settlement and port on Nevis Island and is situated on a bay on the western coast. The main industry in the area is sugar milling. Charlestown became the chief town on the island after Jamestown (the previous main settlement) was destroyed by a tidal wave in 1680. In the late 18th century Charlestown became a naval base and was almost destroyed by a fire in 1873. Notable buildings include Hamilton House, the birthplace of the 18th-century American statesman Alexander Hamilton, who was involved in drafting the Constitution of the United States, and the ruins of Montpelier Estate where Horatio Nelson was married. Population (1994) 1,411. By: Lowell Mason ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Hazardous Environments section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Hazardous Environments essays

  1. Marked by a teacher

    The number of fatalities that result from volcanic and seismic natural hazards is related ...

    4 star(s)

    Mount Etna is associated with the subduction of the African plate under the Eurasian plate, which also produced Vesuvius and Campi Flegrei, but is part of a different volcanic arc. It is a composite stratovolcano, which erupts basalt lava of low viscosity.

  2. Mount St. Helens - Natural disasters.

    The most recent period of unrest began on March 15, 1980. From the 15th through the 21st over 100 earthquakes were recorded. It was a magnitude 4.1 earthquake recorded on March 20 that provided scientists with the first signal that Mount St.Helens might erupt for the first time since 1857.

  1. Compare and contrast the hazards associated with volcanoes and mass movement.

    The next hazard is rockslides these are usually found in mountainous areas where there are large drops and cliffs.

  2. Volcanoes. All volcanoes are formed by the accumulation of magma. Most volcanoes have steep ...

    The composite volcano is formed when magma rising upward through a conduit, erupts at the Earth's surface to form a volcanic cone. The lava spreads over the surrounding area. As the volcanic activity continues, the cone is built to a great height and lava flows form an extensive plateau around its base.

  1. comparing shrewsbury an old town an telfrd a purpose build new town

    The Pride Hill street scores were; 5, 4.5, 3, 3, 5, 2, 4, 3, 4, 4. The High street scores were; 4, 2, 3, 2, 4, 2, 3, 2, 4, 5. This gave an average of 4 for Accessibility, 3.5 for Position of main shops, 3 for Cleanliness of town,

  2. The origin of the Earth

    It cannot tell us much about exactly when they will occur. For that, we must study in detail the plate boundaries themselves. Perhaps the most important role of plate tectonics is that it is a guide to the use of finer techniques for earthquake prediction.

  1. What are plate margins?

    In this type of boundary huge mountain ranges are formed. The best example of this is the Himalayan Mountains. They were formed when the Indian Plate crashed into the European Plate. The two are still being forced into each other, and the Himalayan Mountains are slowly becoming taller.

  2. Volcanic and seismic events are major pieces of evidence towards proving that plate-tectonics theory ...

    He suggested that continents do not move across oceanic crust, but rather the continents and oceanic crust move together. Thus the theory of seafloor spreading answered a major objection of the opponents of continental drift?namely, how could continents move through oceanic crust?

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work