Band 8.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.0 · Cambridge IELTS 21 · 2026-09-18

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 8.0)

The diagram illustrates how a rain-shadow desert is formed as moist air from the sea passes over a mountain range and loses most of its moisture before reaching the inland area.

Overall, the process involves a series of stages, beginning with moisture-laden air moving inland and rising over the mountains, and culminating in the formation of an extremely dry region on the leeward side. The key feature is that most precipitation occurs on the windward slope, leaving the air considerably drier as it descends on the opposite side.

Initially, warm, moist air from the sea is driven towards the mountain range and forced upwards upon reaching the windward slope. As the air rises, it cools, causing water vapour to condense and clouds to form. This is followed by precipitation, during which a substantial amount of moisture is released as rain on the windward side of the mountains.

Having lost much of its moisture, the air then passes over the mountain range and descends towards the leeward side. As it moves to lower altitudes, it becomes warmer and progressively drier. Consequently, very little rainfall reaches the inland region, resulting in increasingly arid conditions and eventually giving rise to a rain-shadow desert.

AI examiner evaluation

Task Achievement / Task Response — Band 8.0

The student successfully covers all key parts of the task, providing a clear overview and detailing all major stages of the rain-shadow desert formation process from the sea to the inland region. The response accurately notes that moist air approaches the coast, rises and cools over the windward side of the mountains where precipitation occurs, and finally descends onto the leeward side as dry air to form an arid rain-shadow desert. The information is fully grounded in the provided diagram, and the stages are reported in a logical sequence without any irrelevant details or misreadings.

Coherence and Cohesion — Band 8.0

The response is exceptionally well-structured and easy to follow. Ideas are logically sequenced, moving seamlessly from an introductory overview to the specific phases of the process. Paragraphing is used appropriately, with each paragraph focusing on a distinct phase of the cycle. Cohesive devices such as 'Initially', 'This is followed by', and 'Consequently' are managed skilfully to guide the reader through the explanation without any mechanical or awkward transitions.

Lexical Resource — Band 8.0

The student demonstrates a wide, flexible, and precise range of vocabulary appropriate for an academic process description. Less common lexical items and collocations are used skilfully and naturally, such as 'moisture-laden air', 'water vapour to condense', 'substantial amount of moisture', 'progressively drier', and 'increasingly arid conditions'. Word choice and collocations are accurate throughout, with no noticeable spelling errors, reflecting a strong control of vocabulary.

Grammatical Range and Accuracy — Band 8.5

The response exhibits a wide range of complex grammatical structures used with a high degree of accuracy. The majority of sentences are error-free, and the writer handles subordinate clauses, participial phrases ('Having lost much of its moisture'), and passive/active voice shifts expertly. Punctuation is flawless, and grammatical control is sustained throughout the entire text, allowing for smooth and clear communication.

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