Band 8.5 IELTS Writing Task 1 Model Answer

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

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 step-by-step process by which a rain-shadow desert forms on the leeward side of a mountain range, as moist air from the sea is intercepted and depleted of moisture.

Overall, the formation involves seven sequential stages: moist maritime air is forced upward over mountains, leading to condensation, rainfall on the windward slope, and subsequent drying of the air as it descends the opposite side - creating arid conditions inland.

Initially, winds carrying moisture approach the coast (1) and are pushed upward along the mountain’s windward slope (2). As the air rises, it cools adiabatically, causing water vapour to condense into clouds (3 to 4). This results in heavy precipitation on the windward side (5), saturating the atmosphere. By contrast, the now-dry air continues over the mountain crest (6) and descends the leeward slope, warming and absorbing moisture from the land below. Consequently, the inland areas receive little to no rainfall, forming a rain-shadow desert (7), located thousands of kilometres from the coast.

Notably, the stark contrast between the wet windward side and the arid leeward side highlights the orographic effect’s decisive role in regional climate differentiation.

AI examiner evaluation

Task Achievement / Task Response — Band 8.5

The response is excellent. You have successfully identified and summarised all key stages of the rain-shadow desert formation process. The overview clearly synthesises the main features, and the body paragraphs provide a logical, step-by-step account of the process. You have effectively used the numbered stages from the diagram to structure your explanation, ensuring that the relationship between the windward and leeward sides is clearly contrasted. The information is accurate, well-developed, and fully addresses the prompt without any irrelevant details.

Coherence and Cohesion — Band 8.5

The response is logically organised with a clear progression from the initial maritime air movement to the final formation of the desert. Paragraphing is used effectively to separate the overview from the detailed process. Cohesive devices such as 'Initially', 'By contrast', and 'Consequently' are used naturally and accurately to guide the reader through the sequence of events. The referencing is precise, and the flow of ideas is smooth, making the text very easy to follow.

Lexical Resource — Band 8.5

You demonstrate a sophisticated and precise control of vocabulary. The use of subject-specific terminology such as 'leeward side', 'windward slope', 'adiabatically', 'orographic effect', and 'regional climate differentiation' is highly appropriate for this task. The vocabulary is not only accurate but also contributes to a professional and academic tone. There are no errors in word choice or collocation, and the range of vocabulary is more than sufficient to convey complex information clearly.

Grammatical Range and Accuracy — Band 8.5

The writing exhibits a wide range of complex grammatical structures, including participial phrases ('leading to condensation', 'creating arid conditions') and subordinate clauses. The sentences are error-free, and the punctuation is used correctly to enhance clarity. The control over tense and aspect is consistent throughout the description of the process. The complexity of the sentence structures is handled with full flexibility, and there are no grammatical slips, reflecting a high level of proficiency.

See this exact question answered at other band scores — the same prompt compared across bands.

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