• 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)

    There were also losses to agriculture as the fertile volcanic soils support a large amount. It has been estimated that only 77 deaths can be attributed to Mount Etna's past 190 eruptions and in the most recent eruptions there have been no fatalities.

  2. Mount St. Helens - Natural disasters.

    Seismologists also consulted with the US Geological Survey about the current earthquake activity. Over the next week, people were worried about earthquake-triggered avalanches would make the USFS to close the mountain above tree line. March 22 - A second earthquake larger than magnitude 4.0 occurred beneath Mount St.

  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 ...

    fragments that solidify and fall as cinders around the vent to form an oval cone. Cinder cones are mostly produced by Strombolian eruptions. They commonly grow in groups and are often found on fissures or in swarms, in both oceanic environments and continental environments.

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

    3 for Variety of leisure facilities, 4.5 for Historic buildings, 2 for Positioning of car parks, 3.5 for Appearance of shopping area, 3 for Variety of shops, 4 for Quality of open space and 4 for Amount of open space.

  2. The origin of the Earth

    In 1912 a German Scientist called Alfred Wagener proposed that these two continents were once joined together then somehow drifted apart. He proposed that all the continents were once stuck together as one big land mass called Pangea. He believed that Pangea was intact until about 200 million years ago.

  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 ...

    A renewed interest in oceanographic research led to extensive mapping of the ocean basins during the 1960s. Such mapping revealed an oceanic ridge system more than 65,000 km long, constituting the most extensive mountain range in the world. Perhaps the best-known part of the ridge system is the Mid-Atlantic Ridge,

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