火山爆发ppt

7. Sangay(桑盖 ) National Park volcano
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）
Volcanic classification
1. active volcano (活火山) 2. extinct volcano （死火山） 3. dormant volcano （休眠火山）
Eruption type
1. Quiet eruption （宁静式喷发）
2. Blasting fierce type eruption （爆烈式喷 发）
volcano eruption
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
through the earth's crust and, where spouted out, causing the volcano.
• This picture show us the process about the forming of volcano.
Part three: Several big active volcanos in the world
3. ash can cause respiratory diseases（呼吸道疾病）
Benefits
1. many of the volcanic materials have important industrial and chemical uses. 2. Volcanic ash that has been weathered (风 化)greatly improves soil fertility.
crustal movement 地壳运动
lava flow 熔岩流
Volcanic Explosivity Index 火山爆发指数
A volcano is a place on the Earth‘s surface (or any other planet’s or moon‘s surface) where molten rock, gases and pyroclastic debris（火山 碎屑） erupt through the earth's crust.
Although the volcano eruptions are terrible, but can also be very beautiful
How to protect yourself in the volcano eruption?
• The only way Go while Βιβλιοθήκη Baiduhe going is good. (三十六计，走为上计。 )
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 Helen's (圣海伦斯 )volcano
6.Monte Etna(埃特纳 ) volcano
3. Middle type eruption （中间式喷发）
Volcanic eruption is how creates?
Originally, the interior of the earth filled with hot magma. Under tremendous
pressure, from weak magma will break