Band 8.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 8.5 · Cambridge IELTS 21 · 2026-09-24

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 student has fully addressed all parts of the task. The response accurately and comprehensively outlines the seven sequential stages of rain-shadow desert formation shown in the diagram, beginning with winds approaching the coast and ending with arid conditions thousands of kilometres inland. A clear overview is provided in the second paragraph, capturing the main features of the process (moist maritime air rising, cooling, producing precipitation on the windward side, and descending the leeward slope as dry air). The comparison between the wet windward slope and the arid leeward side is well integrated, fulfilling the requirement to report main features and make comparisons where relevant. The information is entirely faithful to the visual data without any major omissions.

Coherence and Cohesion: Band 8.5

Cohesion and logical organisation are managed exceptionally well throughout the text. The essay is structured logically into four paragraphs: an introductory sentence, a comprehensive overview paragraph, a detailed chronological body paragraph covering all seven stages, and a concluding analytical sentence. Cohesive devices such as 'Initially', 'As the air rises', 'By contrast', 'Consequently', and 'Notably' are used flexibly and naturally to guide the reader smoothly through the process. Paragraphing is used appropriately, and referencing (e.g., 'the now-dry air', 'the land below') is clear and accurate, resulting in a seamless flow of ideas.

Lexical Resource: Band 8.5

The student demonstrates a wide, flexible, and precise lexical range appropriate for an academic task. Less common and precise vocabulary items are used with skill and accurate collocation, such as 'sequential stages', 'adiabatic', 'water vapour', 'condense', 'precipitation', 'orographic effect', and 'climate differentiation'. Word choice is natural and sophisticated (e.g., 'intercepted and depleted', 'saturating the atmosphere'). There are no noticeable spelling or word-choice errors, demonstrating sophisticated control over a broad range of vocabulary.

Grammatical Range and Accuracy: Band 8.5

The writing exhibits a wide range of complex grammatical structures used with a high degree of flexibility and accuracy. Examples include participial phrases ('as moist air... is intercepted and depleted'), non-defining relative clauses, and multi-clause complex sentences ('As the air rises, it cools adiabatically, causing water vapour to condense into clouds'). Punctuation is handled flawlessly. The vast majority of sentences are completely error-free, with only rare minor slips absent, showcasing full grammatical control.

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