雅思写作考官范文 A类 Task1(地图题) 第2期:the Hawaiian island chain
日期:2014-03-30 11:40

(单词翻译:单击)

写作题目

You should spend about 20 minutes on this task.
The diagram below gives the information about the Hawaiian island chain in the centre of the Pacific Ocean.
Write a report for a university lecturer describing the information shown.

You should write at least 150 words.



参考答案

model answer:

The Hawaiian island chain, in the centre of the Pacific Ocean, is approximately 2,700 km in length. It is formed of volcanoes and the active ones are at the south-east tip of the archipelago, where Hawaii itself is located.

It is believed that the chain began to form nearly 80 million years ago. Each island started to evolve after an eruption on the sea floor. First, a `hot spot' existed on the ocean bed, which let out a plume of material called magma. This magma may originate as deep as 2,883km below the ocean bed. Next, further eruptions took place, which built up the volcano. Eventually, it emerged above the surface of the ocean.

Since that time, the spume of magma has remained static as the Pacific tectonic plate moves in a north-west direction across it at a speed of 7-9cm per year. As it moves, a volcano forms as it passes over the hotspot and then become inactive when it has passed it.

(164 words)

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重点单词
  • originatevt. 发起 vi. 开始 [计算机] 起始
  • diagramn. 图解,图表 vt. 用图解法表示
  • eventuallyadv. 终于,最后
  • minutesn. 会议记录,(复数)分钟
  • volcanon. 火山
  • inactiveadj. 不活动的;不活跃的;怠惰的;闲置的
  • eruptionn. 爆发,喷发,出疹,长牙
  • pacificn. 太平洋 adj. 太平洋的 pacific adj
  • staticadj. 静态的,静力的,静止的,静电的 n. 静电,静
  • evolvev. 进展,进化,展开