Volcanic hazards and people


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A selection of volcanic hazards and how they impact people living next to volcanoes

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Volcanic hazards and people

  1. 1. Why do people risk living near volcanoes?<br />Lesson Objectives<br />All studentsmust be able to explain some of the dangers of volcanoes<br /> <br />Most studentsshould describe the distribution of volcanoes around the world<br /> <br />Some students could be able to explain why people decide to live near volcanoes despite the obvious risks<br />
  2. 2. Eruption on the Caribbean Island of Montserrat<br />Starter<br />Complete the worksheet showing what you might be thinking and sensing if you were there when this happened.<br />
  3. 3. Where are volcanoes found?<br />Map shows the locations of volcanoes<br />Like most volcanoes, Montserrat is located on a plate boundary<br />
  4. 4. Volcanic dangers<br />Volcanoes that have erupted recently are called active volcanoes. We will look at a few of the main dangers.<br />Volcanoes that have not erupted for a long time are called dormant volcanoes.<br />There are many different volcanic eruptions and these produce several hazards.<br />Video clip<br />
  5. 5. Lava<br />Lava is about 1000 C<br />Flows can move slow or fast. They destroy anything in their path<br />
  6. 6. Volcanic Bombs<br />Large bits of hot rock are blasted from the volcano. <br /> They can be as large as cars.<br />They will land on houses, land and cars, setting them on fire<br />
  7. 7. Pyroclastic Flows <br />Fast moving clouds of hot gas and rock blasted from the volcano. Can be over 900 C.<br />Nothing can outrun it-even a car<br />See video<br />
  8. 8. Ash Fall<br />Hot ash can cause lung damage<br />It can destroy crops leading to starvation<br />It blocks out the sunlight<br />
  9. 9. Lahars (mudflows)<br />This is a river of volcanic ash and other debris.<br />These can be triggered eruptions or by heavy rain after an eruption.<br />
  10. 10. Why do people live near volcanoes?<br />Today, about 500 million people live on or close to volcanoes. Why?<br />At first it may seem odd that people would want to live close to a volcano. We have seen the dangers. Yet, throughout history, people have deliberately chosen to risk all the dangers and live near them. <br />Some people even live on the slopes of active volcanoes that have erupted within living memory.<br />So what the benefits of volcanoes?<br />
  11. 11. I’m Rich!<br />
  12. 12. Precious Minerals<br />Magna rising from deep inside the earth contains a range of minerals. Tin, silver, gold, copper and even diamonds can be found in volcanic rocks. <br />Most of the metallic minerals mined around the world, particularly copper, gold, silver, lead and zinc are associated with rocks found deep below extinct volcanoes. <br />This makes the volcanic areas ideal for both large scale commercial mining and smaller scale local activities by local people. <br />
  13. 13.
  14. 14. Geothermal Energy<br />Geothermal energy means heat energy from the earth. <br />The heat from underground steam is used to drive turbines and produce electricity, or to heat water supplies. that are then used to provide household heating and hot water. <br />Countries such as Iceland and New-Zealand make use of geothermal power. Two thirds of Iceland&apos;s electricity coming from steam powered turbines. <br />See video clip<br />
  15. 15. Fertile Soils<br />Volcanic rocks and ash are rich in minerals that have formed in the magma (liquid rock) under the surface of the earth.<br />Over thousands of years the rocks become weathered and broken down, releasing the minerals into the soil. This forms some of the richest soils for farming on the planet<br />
  16. 16. Places such as Mt Elgon in Uganda, and the slopes of Vesuvius in Italy all have productive soils thanks to the breaking down of volcanic rocks and ash.<br />
  17. 17. A quick search for ‘hotel near volcano’ and look how many hits Google found!!<br />Tourism<br />
  18. 18. Tourism<br />Volcanoes attract millions of visitors every year. <br />They are examples of nature at its most extreme!<br />Even the less active volcanoes that are just puffing out steam and smoke are impressive sights.<br />Tourism creates jobs in shops, restaurants, hotels and tourist centres / national parks. Locals economies can profit from volcanoes throughout the year, whereas skiing, for example, has only a limited winter season. <br />
  19. 19. Geysers are always popular tourist attractions. Old Faithful is such a popular tourist feature that it even has its own 24 hour Old Faithful webcam. <br />Iceland attracts tourists with a mix of volcanoes and glaciers, often both in the same place. For example, natural hot springs.<br />
  20. 20. Geyser<br />
  21. 21. Why do people live near volcanoes?<br />For many people, the benefits of living near to a volcano outweigh the potential dangers.<br />Many people in areas close to volcanoes many not be able to afford to move to alternative areas.<br />For example, if you were a farmer in Uganda, if you move away from the good soils near the volcano, you won’t be able to grow any crops.<br />
  22. 22. Nevado del Ruiz, ColombiaVolcano Case Study<br />
  23. 23. Complete the table<br />Try to pick out the important information on the Nevado Del Ruiz volcano and its impacts on the surrounding area <br />Try to get at least 6 facts<br />4 or more positive points<br />4 or more negative points/dangers<br />