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Process Diagram

Band 8+: The diagram below shows how geothermal energy is used to produce electricity. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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Image for topic: The diagram below shows how geothermal energy is used to produce electricity. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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The image shows a labeled diagram of a geothermal power plant, with annotations indicating the flow of cold water down 4.5 km into the injection well, through the geothermal zone containing hot rocks, and up the production well as hot water, which powers a turbine connected to a generator that produces electricity, and then passes through a condenser to be pumped back down, completing the cycle.

Given the complexity of the image, the above description may not be entirely accurate.

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The diagram shows that there are five main stages in the production of electricity through the use of geothermal energy.

The process begins with cold water being pumped from the surface of the earth down into a 4.5 kilometer-deep injection well. From there, it is transferred to the geothermal zone, a subterranean region composed of hot rocks, before reaching the production well, which is a vertical pipe similar to the injection well but a bit wider.

In the stage that follows, the hot water is pumped up through the production well into a condenser on the surface where it is converted into steam, following which it is used to power a turbine and rotate it. This turbine is connected to an electricity generator which, when rotated by the turbine, produces electricity. The process ends when the electricity generated by the generator is transferred to the power grid for consumption by end users.

Word Count: 152

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Overall Band Score

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Vocabulary Complexity:
C2 - Complex
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Grammar Mistakes: N/A

Vocabulary Repetition:

electricity: 4

production: 3

which: 3

turbine: 3

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Task Response

The report provides a good overview of the process, but it misses some key details and comparisons. For example, it doesn't mention the role of the condenser in cooling the steam and returning it to the injection well. It also doesn't compare the injection and production wells.

Coherence & Cohesion

The report is well-organized and easy to follow. The information is presented in a logical order, and the use of cohesive devices is effective.

Lexical Resource

The report uses a good range of vocabulary, but there are some instances where more precise or sophisticated language could be used.

Grammatical Range & Accuracy

The report demonstrates a high level of grammatical accuracy and control. The sentences are well-constructed and varied.

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Band 8+: The diagram below shows how geothermal energy is used to produce electricity. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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Overall Band Score

Task Response

Coherence & Cohesion

Lexical Resource

Grammatical Range & Accuracy

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The diagram below shows how geothermal energy is used to produce electricity. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The diagram below shows how geothermal energy is used to produce electricity. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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