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

Volcanoes at destructive and constructive margins

Extracts from this document...

Introduction

Volcanic impacts are more hazardous near destructive margins than constructive ones. Discuss. I agree that volcanic impacts are more hazardous near destructive margins than constructive ones. Destructive margins occur where continental and oceanic plates converge together or oceanic and oceanic plates converge together. For the former, the continental crust has a rock density much lower than the oceanic crust. As these two plates meet the oceanic crust is submerged underneath the continental crust, as it is denser. This causes a subduction zone to form where deep sea trenches result. As the oceanic plate is submerged, it begins to melt due to increased heat and friction. The melting of the plate results in magma building up, which eventually rises up to the surface as volcanoes. As for the later, the denser plate will be subducted and some of the magma will rise through fractures in oceanic crusts and pour onto ocean floor, forming undersea volcanoes. ...read more.

Middle

The composite volcanoes are typically steep-sided, symmetrical cones of large dimension built of alternating layers of lava flows, volcanic ash, and cinders. As lava is acidic, the lava is thick and sticky and this viscosity of the lava does not allow trapping gas to escape. Additionally, the lava solidifies in the central pipe, blocking the passage and these built up the pressure in the volcano. Therefore when the volcano erupts, there will be violent explosion as ash and act as a medium of transportation for lava and allow the lava to flow over them quickly. Also, pyroclastic materials will also be poured out. The shield volcano is a gently sloping volcano that is flat near the top and is built entirely by basic lava. By its basic nature, the lava is more fluid and it flows faster than the lava in the composite volcano before solidifying. However, unlike the composite volcano, there will be no explosion when the volcano erupts at a constructive margin, as there is no pressure and thus gas can escape easily through the less viscous lava, and very little pyroclastic material or none is found within the volcano. ...read more.

Conclusion

Certainly, there will be volcanoes that have not grown and are underwater; their eruptions might be invisible on sea surface and will not affect any human beings. On the other hand, volcanoes at destructive margins are usually located on land, but there are some exceptions that are also located on sea. Those that are on land are very hazardous as many people stay around the volcano because the volcano lava can form fertile land for agriculture uses. Thus, when the volcano erupts, the volcanic impacts are disastrous and hazardous as many people and their homes are affected. One example of such cases is the Mount Pinatubo in The Philippines. The human impacts of the disaster are staggering. In addition to the up to 800 people who lost their lives, there was almost one half of a billion dollars in property and economic damage. In conclusion, the volcanic impacts at destructive margins are more hazardous than those at constructive ones. Composite volcanoes, at destructive margins, are more explosive than shield volcanoes, at constructive margins, because composite volcanoes contain pyroclastic flows and are mostly located on land. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Physical Geography 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 GCSE Physical Geography essays

  1. Physical Case Studies AQA Revision notes - Ice, rivers and volcanoes.

    the experience for birdwatchers, ignorant winter sports enthusiasts going off-piste and having to be rescued by mountain rescue team, costing them time and money, lack of parking in village, increased traffic due to tourism, crowding, expensive goods in the shops and restaurants, making essential products for locals that remain unnecessarily expensive, high cost of houses, hikers etc.

  2. The structure of the Earth and the impact of volcanic eruptions.

    There is no upper limit to the scale. The Richter scale measures how much seismic energy is released called it's magnitude through seismogram readings. Mercalli scale: The Mercalli scale measures the effect of earthquakes on a scale from 1-12, and uses descriptions of how bad the damage is.

  1. Plannng an expedition to an extreme environment.Svalbard. Glaciers as an attraction and under threat.

    4: What the likely effects on melting glaciers in the sea around Svalbard Islands? Think about salinity, exposure to erosion and changes in the land/sea level. Salinity: amount of salt dissolved in water. Melting glaciers in the sea around Svalbard Islands effects on a lot of things such as the

  2. mount pinatubo

    Buildings damaged: * Weight of the ash caused buildings to collapse, including 200,000 homes, a local hospital, most of the schools and many factories. Infrastructure damaged: * Roads became unusable (ash and lahars), bridges were destroyed (making relief operations even more difficult); electricity was cut off (for three weeks); water

  1. The Long Term Effects of Volcanic Eruptions

    The sound of the explosion could be heard from Australia, more than 4000 km away. Long-term effects The volcanic eruption produced seaquakes that caused 100-foot high tsunamis that circled the globe six and a half times and drowned more than 36,000.

  2. New Orleans Geology

    Houses and other buildings close to the shoreline are at a huge risk of being lost due to erosion of the land around them. The waters just pound the coast line pushing it further and further back until the house or building could eventually collapse into the water.

  1. Taal Volcano

    However, the Main Crater Lake is where 12 of Taal's eruptions took place, while the five major eruption centers are namely Binintiang Malaki, Binintiang Munti, Pira-piraso, Calauit and Mt. Tabaro (Figure 3.1). There are many different landforms in Taal but the more recognizable features include, Mt.

  2. Earthquakes and volcanoes research

    There are three major types of faults: strike-slip, normal, and reverse Normal Fault Plates are pulled apart and one side moves down. Normal faults usually occur at divergent plate boundaries. Reverse Fault The plates push together while one side moves up.

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