What are the advantages? What happens when it erupts?

2. What are the advantages? What happens when it erupts?

3. These are the countries we are going to mention today – do you know which they are?

4. People live close to volcanoes because they felt that the advantages outweighed the disadvantages. • Most volcanoes are perfectly safe for long periods in between eruptions • Today, about 500 million people live on or close to volcanoes. • We even have major cities close to active volcanoes. Popocatapetl is a volcanic mountain less than 50 miles from Mexico City in Mexico. • In short, the main things that attract people to live near active volcanoes are minerals, geothermal energy, fertile soils and tourism. • Lets look at each one...

5. Minerals • Magna rising from deep inside the earth contains a range of minerals. • This means that minerals such as tin, silver, gold, copper and even diamonds can be found in volcanic rocks. • Hot gasses escaping through vents of active volcanoes also bring minerals to the surface, notably sulphur, which collects around the vents as it condenses and solidifies.

6. Geothermal Energy • Geothermal energy means heat energy from the earth. • 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. • Where steam doesn't naturally occur it is possible to drill several deep holes into very hot rocks, pump cool water down one hole and extract steam from another hole close by.

7. Geothermal Energy • Countries such as Iceland make extensive use of geothermal power, with approximately two thirds of Iceland's electricity coming from steam powered turbines. • Iceland has over 200 volcanoes and 800 hot springs • 26% of Iceland’s electricity comes from Geothermal Power. • Reykjavik is said to be “the most unpolluted capital in Europe.”

8. Other uses of Geothermal power in Iceland • It is also used for recreational purposes • Blaa Lonio - The Blue Lagoon. In the middle of this huge lava field sits this pool of seawater naturally heated by the geothermal activity below the surface

9. Fertile Soils • Volcanic rocks are rich in minerals, but when the rocks are fresh the minerals are not available to plants. • The rocks need thousands of years to become weathered and broken down before they form rich soils. • When they do become soils though, they form some of the richest ones on the planet. • The Naples area, which includes Mount Vesuvius, has such rich soils thanks to two large eruptions 35,000 and 12000 years ago. Both eruptions produced very thick deposits of ash and broken rocks which have weathered to rich soils.

10. Tourism • Around the volcano may be warm bathing lakes, hot springs, bubbling mud pools and steam vents. • Geysers are always popular tourist attractions, such as Old Faithful in the Yellowstone National Park, USA. Old Faithful is such a popular tourist feature that it even has its own 24 hour Old Faithful webcam.

11. Tourism • Iceland markets itself as a land of fire and ice, attracting tourists with a mix of volcanoes and glaciers, often both in the same place. • The wild, raw and barren volcanic landscapes also attract tourists who want to see what the early planet may have looked like. • Locals economies can profit from volcanism throughout the year, whereas skiing, for example, has only a limited winter season. • In Uganda, a country trying hard to increase its tourist industry, the volcanic region around Mt Elgon is being heavily promoted for it's landscape, huge waterfalls, wildlife, climbing and hiking and its remote 'get away from it all' location.

12. Building Materials • Blocks of lava are used for building materials • Granite is a volcanic rock • Ash is used in cement to build with.

14. They stay there because there is nowhere else to go – it is home • Some people are too poor to leave their home (especially in LEDCs) – also poor education does not explain why they should move further away • Even when people can afford to leave the area they may be too attached to their homes to leave. Their families have been there for generations. • And there are so many people living in these dangerous areas, that it would difficult if not impossible to re-house them, especially as many areas that provide food for so many other people.

18. Exam question Explain the reasons why people live in volcanic areas (7)

19. Examples of questions Outline why people continue to live on volcanic islands (4) • For and area you have studied that is prone to volcanoes explain why people continue to live there (6)