Band 8.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.5 · Cambridge IELTS 21 · 2026-09-30

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 rain-shadow deserts are formed, showing how moist air from the sea travels across a mountain range before producing dry conditions on the inland side.

Overall, the formation of a rain-shadow desert involves seven main stages, beginning with winds carrying moist air towards the coast and ending with dry winds reaching inland areas. The crucial process occurs as air rises and cools on the windward side of the mountains, causing rainfall, after which the remaining air becomes progressively drier as it descends on the leeward side.

Initially, winds approach the coast from the sea and are forced upwards as they encounter the mountain range. As the moist air rises along the windward side, it cools, which leads to the formation of clouds. Once sufficient clouds have developed, rain falls on the windward side of the mountains, resulting in the loss of much of the air's moisture.

The now-dry air then continues over the mountain range and descends on the leeward side. As it moves downhill, it becomes increasingly dry and eventually forms dry winds. These winds continue towards the inland areas, where the lack of moisture and rainfall creates the characteristic rain-shadow desert. Thus, the mountains effectively prevent substantial amounts of moisture from reaching the region beyond them.

AI examiner evaluation

Task Achievement / Task Response: Band 8.5

The student fully addresses all parts of the task by providing a clear and comprehensive summary of the rain-shadow desert formation process. The response effectively outlines all seven key stages depicted in the diagram, from the initial winds approaching the coast to the creation of the desert inland. An effective overview is provided in the second paragraph, capturing the main overarching trend of moisture depletion across the mountain range. Crucial features, such as air rising, cooling, and producing precipitation on the windward side followed by dry conditions on the leeward side, are accurately reported and well-supported with information from the visual data. The response meets the highest standards of task fulfillment.

Coherence and Cohesion: Band 8.5

The text is exceptionally well-structured and logically organized. Information flows smoothly from the introduction to the overview, then through the sequential stages of the process, and finally to the conclusion. Paragraphing is used skillfully, with each paragraph serving a distinct and logical purpose (introduction, overview, initial stages, and final stages). Cohesive devices such as 'Initially', 'Once sufficient clouds have developed', and 'The now-dry air then continues' are employed naturally and appropriately to guide the reader through the explanation without any mechanical feel or awkward referencing.

Lexical Resource: Band 8.0

The student demonstrates a wide, fluent, and flexible range of vocabulary appropriate for an academic report describing a scientific process. Less common lexical items and collocations are used skillfully, such as 'rain-shadow desert', 'windward side', 'leeward side', 'moisture depletion', and 'progressively drier'. Word choices are precise, and there are no noticeable inaccuracies or spelling errors throughout the response. The terminology matches the demands of the visual data perfectly, reflecting a sophisticated control of vocabulary.

Grammatical Range and Accuracy: Band 8.0

The response features a wide range of complex sentence structures used with full flexibility and high accuracy. The student successfully incorporates various dependent clauses and participial phrases, such as 'showing how moist air from the sea travels across a mountain range before producing dry conditions' and 'resulting in the loss of much of the air's moisture.' The majority of sentences are completely error-free, and punctuation is handled with precision. Control over grammar is strong throughout, demonstrating a high level of grammatical maturity.

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