介绍火山喷发(英语).ppt

1、How much do you know aboutvolcano eruption(火山喷发)?,2009011219 李亮,Part one：what is volcano?,Some words about volcano： active volcano 活火山 extinct volcano 死火山 volcanic ash 火山灰 reawaken 再度觉醒,volcanologist 火山学家 rock-magma岩浆 crustal movement 地壳运动 lava flow 熔岩流 Volcanic Explosivity Index 火山爆发指数,volcano,A vo

2、lcano is a place on the Earths surface (or any other planets or moons surface) where molten rock, gases and pyroclastic debris（火山碎屑） erupt through the earths crust.,Volcanic classification,active volcano (活火山) extinct volcano （死火山） dormant volcano （休眠火山）,Eruption type,Quiet eruption （宁静式喷发） Blasting

3、 fierce type eruption （爆烈式喷发） Middle type eruption （中间式喷发）,Part two:Volcanic eruption is how creates?,Originally, the interior of the earth filled with hot magma. Under tremendous pressure, from weak magma will break through the earths crust and, where spouted out, causing the volcano.,This picture

4、show us the process about the forming of volcano.,Part three:Several big active volcanos in the world,1.The Laki(拉基) volcano in Iceland,2.Kilauea（基拉维厄） Volcano,3.Mauna Loa(冒纳罗亚) volcano,4.Vesuvius(维苏威 ) Volcano,5.Mount St Helens (圣海伦斯 )volcano,6.Monte Etna(埃特纳 ) volcano,7. Sangay(桑盖 ) National Park

5、volcano,Part four: the harms and benefits of volcano,Harm 1.Cause great bad impact on the global climate 2. Ash and rain mixed form mudslides（泥石流） 3. ash can cause respiratory diseases（呼吸道疾病）,many of the volcanic materials have important industrial and chemical uses. 2. Volcanic ash that has been weathered (风化)greatly improves soil fertility.,Benefits,Part five:how to protect yourself in the volcano eruption?,