雅思写作(A类)真题：
You should spend about 20 minutes on this task.
The diagram below gives the information aboutthe Hawaiian island chain in the centre of thePacific Ocean.
Write a report for a university lecturerdescribing the information shown.
You should write at least 150 words.
雅思写作(A类)真题范文：
model answer:
The Hawaiian island chain, in the centre of the PacificOcean, is approximately 2,700 km in length. It isformed of volcanoes and the active ones are at thesouth-east tip of the archipelago, where Hawaii itselfis located.
It is believed that the chain began to form nearly 80 million years ago. Each island started toevolve after an eruption on the sea floor. First, a `hot spot' existed on the ocean bed, whichlet out a plume of material called magma. This magma may originate as deep as 2,883kmbelow 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 ina north-west direction across it at a speed of 7-9cm per year. As it moves, a volcano forms asit passes over the hotspot and then become inactive when it has passed it.
(164 words)