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1、Unit 5 The power of nature,Learning aims of unit five,了解火山、飓风、地震和洪水等自然灾害，认识到人类只有保护自然，才能有效地预防自然灾害并改造和利用自然；学习有关火山、飓风、地震和洪水等自然灾害的词汇；学会表达喜悦、恐惧、焦虑和惊奇等情感的日常交际英语；进一步巩固动词-ing形式作状语的用法；学习描述一种自然灾害。,Have you ever considered how weak humans are compared with a volcano,hurricane or earthquake?,Can you list some n
2、atural disasters?,Boiling rock erupts from the crater(火山口);the lava(熔岩)flows slowly down the mountain.,gas,liquid,solid,lava(熔岩),vapour,carbon dioxide,nitrogen(氮),sulphur(硫磺),bits of rock and volcanic ash,etc.,1.How is a volcano formed?,One plate crashes down into another.The fluid rock becomes hott
3、er and hotter with high pressure.Finally it rushes out.Thus,a volcano is formed.,Where is it most possible for a volcano to erupt?,Joints between the plates.,Joints between the plates.,Joints between the plates.Often near the oceans.,3.What types of volcanoes do you know?,extinct volcano(=one that i
4、s no longer active at all),dormant volcano(=one that is not active at the moment),active volcano(=one that may erupt at any time),1.Whats the main idea of the article?,The writer expressed his _ for his job as a _ and told us one of his unusual _in Mount Kilauea,Hawaii.,love,volcanologist,experience
5、s,2.Find out main ideas for each part.,Part 1(Para 1-2)Part 2(Para 3-4)Part 3(Para 5),The writers _ and its _.,job,importance,The writers _of watching the volcanic eruption.,experience,The _ for the writers enthusiasm about his job.,reasons,Why does the writer say that he has the greatest job in the
6、 world?,2.Why is a volcanologists job important?,It can warn people when the volcano is going to erupt and save many lives.,3.Where is Mount Kilauea?,In Hawaii.,4.Why is the lava that flows on Mount Kilauea more dangerous than the actual eruption?,No one lives near the crater.,The lava flows down th
7、e mountain and can cover up or burn villages in its path.,The lava flows down the mountain and can cover up or burn villages in its path.The rocks that erupt from the volcano dont damage anything because no one lives near the crater.,5.What caused the writers bedroom to become as bright as day even
8、though it was night?,the red-hot rocks,gas that erupted from the volcano,The light was caused by the red-hot rocks and gas that erupted from the volcano.,6.Why did the scientists have to get close to the volcano after it began erupting?,samples of the lava,study the samples,The scientists needed to
9、get samples ofthe lava so they could study them.,7.Why was it difficult for the writer to walk towards the edge of the crater?,white protective suits,special glove,helmet,special boots,The author was wearing special clothing that made it difficult to walk.,What does the writer find impressive about volcanoes even after studying them for many years?,The writer finds their beauty and their potential to cause great damage very impressive.,
