Volcanic Eruption
Have you ever experienced of any natural disasters? There are many kinds of natural disasters such as tsunami, earthquake, and volcanic eruption that have been occurring throughout the earth history. These are happening mostly because of the fact that 'the earth is alive'. The earth is covered with big rocky plates and these plates are constantly moving and sometimes bumping into each other. Here, we are going to see a volcanic eruption, which is one of the phenomena caused by moving plates.
The earth is composed of 4 layers; crust, mantle, outer core, and inner core from the top. Under the crust, the degree C inside mantle, outer core and inner core is so much high that rocks are being melted into magma. This hot magma flows and circulates under the crust. If there is a rift in the earth's crust, the magma flows out through this crack steadily. But this is 'an eruption'. Then what is it?
Volcanic eruptions occur at the thin parts of the crust but with no rift. If there is no rift, magma cannot go out of the crust, which means the magma gets accumulated under the crust. If this captivated-magma-situation lasts for some time, the hot steam from magma, also accumulated, starts to put pressure up to the crust. Since this is a thin part, these suppressed magma and steam soon make such a big outburst – the volcanic eruption! Along the eruption, there comes out of volcanic gas, lava, pyroclastic debris, etc. Pyroclastic debris, such as volcanic ash, usually floats in the air. This leads to sun-blocking and affects the weather. Flowing-down lava makes the geographical changes around there.
Volcanoes are mostly located on the area of plates' meeting points. The most well known is Japan. Japan island itself is the result of the volcanic eruption. As you know, there have been many devastating earthquakes including the Great Earthquake in Japan for a long time. Volcanic eruption, as a natural disaster, kills people and gives tremendous damages. To prevent this, people do research and try to make precautionary activities.
Siho Yang
ReplyDeleteLet me change the sentence "But this is 'an eruption'." into "But this is not 'an eruption'." That was a mistake :p
Thank God i don't have to say 'yes' to your question in the intro!!
ReplyDeleteWell, i enjoyed your essay very much. Your essay seems very specific with details and examples. In fact, i came to learn alot from your writing! ;)
There are two things i'd like to talk about though.
First, it would have been much better for reader to follow if you used sign postings or transitions. Since the writing is about the process, those would be helpful, especially you have many definitions and explanations along with processes.
Moreover, i want to say that the first one or two sentences in your conclusion seem more like new information or background info that is supposed to be appearing in the intro. Instead of presenting new ideas in the conclusion, it would be better if you include a brief summary of the ideas in the body as well as restating your thesis statement.
Good piece of writing! ;) Thanks!
Hi,read your work and here are some questions about it.
ReplyDeleteFirst, Aren't we supposed to write a five-paragraph essay??
And you wrote down your thesis statement as 'we are going to see a volcanic eruption, which is one of the phenomena caused by moving plates', but it's not the purpose of 'preparing' for a special occasion. Don't you think you needed to have your essay focused on that?
Even though your essay is informative in that you fully explained the procedure how volcanos erupt, but the preventive methods, I think it's too vague. The other things are quite well followed comparing to the other stuff, though.
REVISION
ReplyDeleteVolcanic Eruption
Have you ever experienced of any natural disasters? There are many kinds of natural disasters such as tsunami, earthquake, and volcanic eruption that have been occurring throughout the earth history. These are happening mostly because of the fact that ‘the earth is alive’. The earth is covered with big rocky plates and these plates are constantly moving and sometimes bumping into each other. Here, we are going to see a volcanic eruption, which is one of the phenomena caused by moving plates. Volcanic eruption process includes 3 stages; Rocks melting into magma, magma being accumulated, and exploding.
The earth is composed of 4 layers; crust, mantle, outer core, and inner core from the top. Under the crust, the degree C inside mantle, outer core and inner core is so much high that rocks are being melted into magma. This hot magma flows and circulates under the crust. If there is a rift in the earth’s crust, the magma flows out through this crack steadily. But this is not ‘an eruption’. Then what is it?
Volcanic eruptions occur at the thin parts of the crust but with no rift. If there is no rift, magma cannot go out of the crust, which means the magma gets accumulated under the crust. If this captivated-magma-situation lasts for some time, the hot steam from magma, also accumulated, starts to put pressure up to the crust.
Since this is a thin part, these suppressed magma and steam soon make such a big outburst – the volcanic eruption! Along the eruption, there comes out of volcanic gas, lava, pyroclastic debris, etc. Pyroclastic debris, such as volcanic ash, usually floats in the air. This leads to sun-blocking and affects the weather. Flowing-down lava makes the geographical changes around there.
To sum up, volcanoes are created through 3 steps; melted magma circulation, an accumulation, and an explosion. Volcanoes are mostly located on the area of plates’ meeting points. The most well known is Japan. Japan island itself is the result of the volcanic eruption. Volcanic eruption, as a natural disaster, kills people and gives tremendous damages. To prevent this, people have been doing research and trying to make precautionary activities.