Band 8.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.5 · Cambridge IELTS 21 · 2026-08-11

IELTS Writing Task 1 question

The diagram below shows how one type of desert, known as a rain-shadow desert, is formed.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The formation of rain-shadow deserts

Student answer (Band 8.5)

The diagram illustrates the process by which a specific type of desert, known as a rain-shadow desert, is created through the interaction of prevailing winds, mountain barriers, and atmospheric moisture.

Overall, the process consists of a two-sided mechanism: moist air loses its water content while ascending the ocean-facing side of a mountain, leaving dry air to descend on the opposite side, which ultimately results in arid desert conditions.

On the windward side, warm, moisture-laden air originates over the ocean and moves inland toward a high mountain range. As this air is forced upward along the mountain slope, it cools down and condenses to form clouds. This leads to heavy precipitation (rain or snow) on the windward slopes, which supports dense vegetation and lush ecosystems.

Conversely, once the air passes over the peak to the leeward side, it has lost most of its moisture. As this now-dry air descends down the far slope, it warms up and absorbs ambient moisture rather than releasing it, leading to high rates of evaporation. Consequently, the land situated in this "shadow" receives very little rainfall, creating the dry and barren conditions characteristic of a rain-shadow desert.

AI examiner evaluation

Task Achievement / Task Response — Band 8.5

The response is excellent. You have fully addressed all parts of the task by clearly explaining the process of rain-shadow desert formation. You successfully identified the main features, such as the windward and leeward sides, and made effective comparisons between the two. The overview provided in the second paragraph is particularly strong, as it concisely summarizes the core mechanism of the process. The information is well-selected and logically presented, ensuring the reader understands the transition from moisture-laden air to arid conditions. No key features were omitted, and the response maintains a clear focus throughout, meeting all requirements for a high band score.

Coherence and Cohesion — Band 8.5

The response is logically organized with a clear progression of ideas. Each paragraph has a distinct focus, moving from an introduction and overview to the specific stages of the process. Cohesive devices such as 'On the windward side,' 'Conversely,' and 'Consequently' are used naturally and effectively to guide the reader through the sequence of events. The paragraphing is skillful, and the relationship between the windward and leeward sides is clearly established through contrast. There is no evidence of mechanical or repetitive use of linking words; the flow is smooth and professional throughout the entire text.

Lexical Resource — Band 8.5

You have demonstrated a wide and sophisticated range of vocabulary. The use of precise terminology such as 'prevailing winds,' 'moisture-laden,' 'condenses,' 'precipitation,' and 'ambient moisture' is highly appropriate for an academic task. The language is natural and shows a high level of control, with no errors in word choice or collocation. You have successfully used less common lexical items to describe the scientific process accurately, which contributes to the overall clarity and professional tone of the report. The vocabulary is not only accurate but also varied, enhancing the quality of the description.

Grammatical Range and Accuracy — Band 8.5

The response exhibits a wide range of grammatical structures with full flexibility and accuracy. You have used complex sentences effectively, such as 'As this air is forced upward along the mountain slope, it cools down and condenses to form clouds.' Punctuation is used correctly to manage these complex structures, and there are no grammatical errors. The majority of sentences are error-free, and the control over verb tenses and clause structures is excellent. The writing is polished and demonstrates a high level of proficiency, with no slips that would impede communication or distract the reader.

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