| Jimin Baik / 3rd assignment / What makes a volcano erupt? / Thursday 11 a.m. to 1 p.m.
Volcano Eruption
On 24 August, 79 A.D., mountain Vesuvius in modern Naples erupted and killed everyone in Pompeii within few days. This eruption was so sudden and intense that every living thing in the village is preserved exactly as it was. Including this one, many volcano eruptions have threatened human civilization through the human history. Through many studies, it has been found that there are three processes that make a volcano erupt: first, the formation of volcano; second, the creation of magma chamber; and lastly, elevation of pressure in the chamber.
To be aware of what makes the volcano erupt, first it is necessary to understand what exactly is volcano, and how volcano is formed. A volcano is an opening or rupture in a planet's surface which allows volcanic ash, gases and hot magma to escape from below the surface. There are two causes that a volcano is formed, and one of them is divergence or convergence of tectonic plates. In this case, volcanoes are formed where two plates slide past one another. For instance, the Pacific Ring of Fire was caused by two plates coming together. Next cause is stretch in the interiors of tectonic plates. The Rio Grande Rift in North America is an example that was formed for this reason. To sum up, it is obvious that volcanoes are the weakest part of the earth's surface.
Volcano eruption starts from the creation of magma chamber. There is a layer called 'rock bed' below the crust. Rock bed, which is close to the mantle, melts by the heat from the mantle and changes to magma. Lots of air is dissolved inside the magma, making it lighter than the solid rock. Since magma is lighter, it goes up and melts hard rocks on the way. For the same reason, newly-created magma goes up, and again, creates magma on its way. Then finally, with gathered magma, a magma chamber is created in depth of around 3 kilometers from the surface.
When the pressure in the chamber goes to the limit, a volcano explodes. Since the surface's temperature is lower than the mantle, the magma chamber as well as the magma inside it starts to cool down. Then air bubbles start to form. This is because when liquid cools down, it can't hold as much air as it could when it was hotter. Then gas from these bubbles raises the pressure inside the magma chamber. The pressure inside the chamber can go high when the gas emission is high and earth's volume is thick. Also, the pressure heightens when magma keeps staying inside the magma chamber. Finally, when the pressure hits the limit, magma and gas find somewhere to go out. As I mentioned earlier, since a volcano is the weakest part of the Earth's surface, magma and gas come out from a volcano. This is a volcano eruption.
In conclusion, for a volcano eruption, first a volcano and a magma chamber have to form, and then pressure within the chamber has to go up over the limit. Although sometimes volcano eruptions put serious threat to human civilization, most of them can be predicted earlier. Many scientists say that the eruption that buried ancient Pompeii could also be predicted by signals such as light earthquakes and constant gas emissions. A little bit of attention towards the eruption can help humans avoid the worst result.
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Monday, March 26, 2012
Jimin Baik / 3rd assignment / What makes a volcano erupt? / Thursday 11 a.m. to 1 p.m.
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First, I enjoyed your writing very much!
ReplyDelete1. What I like about your writing is your hook sentence. I like that you mentioned about Vesuvius and Pompeii and because I know about this famous event, I was curious about what you are going to talk about next. Also I like that you informed the date at the beginning to be specific and that you put a warning in the conclusion. Your writing was smooth to read and very informative.
2. Your main point seems to be the process of the eruption of a volcano.
3. Your choich of words were good. I liked that you described the eruption 'sudden' and 'intense' in the introduction. The words were descriptive. Also, the words that express the process of volcano eruption, like 'dissolved' or 'cools down' or 'hits the limit', was very interesting.
4. There was nothing I couldn't understand. In fact, I learned some words like 'rupture', 'divergence', 'convergence' and 'tectonic'.
5. I just wish you explained some unfamiliar words, making easier to understand the process.
I really like your essay! I actually wrote the same topic essay and I found out that mine was terrible!!! haha :D I can see that you really did investigate 'the volcano' and prepare for writing. The essay was so well-organized that I can easily follow the process. Also, the words, and detalis like examples were appropriate. Thesis statement and conclusion were also well summarized. I don't think there is something to point out. It was good!
ReplyDeleteTo Jimin Baik from Shinhye Lee
ReplyDelete1. What I like about this writing is your topic. Actually I had an interes in your essay because your topic was same one with mine. Also, your essay is really interesting because you organized structure very logically.
2. your main point seems to be very clear, so I can understand your point very easily.
3. Especially your hook sentence is really interesting. Because your hook sentence was about pompeii,mine was about pompeii too, but you made some back ground paragraph following the hook sentence. your background paragraph was explaining what the volcano is..and that was helpful to understand "Volcano eruption".
4. However, on the last para, I could not understand this sentence easily. You'd better to use comma after 'first' and I was wondering that.. which one is correct between "magma chamber have to form, or have to be formed.."
5. But, actually your essay was quite well organized one and I enjoyed your essay.
Jimin Baik / Second Draft of 3rd Assignment / What makes a volcano erupt? / Thursday 11 a.m. to 1 p.m.
ReplyDeleteVolcano Eruption
On 24 August, 79 A.D., mountain Vesuvius in modern Naples erupted and killed everyone in Pompeii within few days. This eruption was so sudden and intense that every living thing in the village is preserved exactly as it was. Including this one, many volcano eruptions have threatened human civilization through the human history. Through many studies, it has been found that there are three processes that make a volcano erupt: first, the formation of volcano; second, the creation of magma chamber; and lastly, elevation of pressure in the chamber.
To be aware of what makes the volcano erupt, first it is necessary to understand what exactly is volcano, and how volcano is formed. A volcano is an opening or rupture in the crust, which is the surface of the Earth. It allows volcanic ash, gases and hot magma to escape from below the crust. There are two causes that a volcano is formed, and one of them is divergence or convergence of tectonic plates. In this case, volcanoes are formed where two plates slide past one another. For instance, the Pacific Ring of Fire was caused by two plates coming together. Next cause is stretch in the interiors of tectonic plates. The Rio Grande Rift in North America is an example that was formed for this reason. To sum up, it is obvious that volcanoes are the weakest part of the earth’s surface.
Volcano eruption starts from the creation of magma chamber. There is the rock bed, which is a layer consisted of rocks, below the crust. Some part of rock bed melts by the heat from the mantle, which is the layer right below the crust, and changes to magma. Lots of air is dissolved inside the magma, making it lighter than the solid rock. Since magma is lighter, it goes up and melts hard rocks on the way. For the same reason, newly-created magma goes up, and again, creates magma on its way. Then finally, with gathered magma, a magma chamber is created in depth of around 3 kilometers from the surface.
When the pressure in the chamber goes to the limit, a volcano explodes. Since the surface’s temperature is lower than the mantle, the magma chamber as well as the magma inside it starts to cool down. Then air bubbles start to form. This is because when liquid cools down, it can’t hold as much air as it could when it was hotter. Then gas from these bubbles raises the pressure inside the magma chamber. The pressure inside the chamber can go high when the gas emission is high and earth’s volume is thick. Also, the pressure heightens when magma keeps staying inside the magma chamber. Finally, when the pressure hits the limit, magma and gas find somewhere to go out. As I mentioned earlier, since a volcano is the weakest part of the Earth’s surface, magma and gas come out from a volcano. This is a volcano eruption.
In conclusion, for a volcano eruption, first a volcano and a magma chamber have to be formed, and then pressure within the chamber has to go up over the limit. Although sometimes volcano eruptions put serious threat to human civilization, most of them can be predicted earlier. Many scientists say that the eruption that buried ancient Pompeii could also be predicted by signals such as light earthquakes and constant gas emissions. A little bit of attention towards the eruption can help humans avoid the worst result.