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Band 6+: line graphs show the size of the ozone hole in Antarctic and three types of damaging gases that damage the Antarctic ozone from 1980 to 2000.

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Image for topic: line graphs show the size of the ozone hole in Antarctic and three types of damaging gases that damage the Antarctic ozone from 1980 to 2000.

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The image contains two graphs: first graph displays Antarctic ozone hole size in thousand square kilometers, marking data points at 1(1980)-50, 2(1985)-100, 3(1990)-170, 4(1995)-220, and 5(2000)-240; second graph showcases production in thousand metric tonnes of damaging gases Freon, NO2, and H2O2 from 1980-2000, illustrating Freon data points at 1(1980)-100, 2(1985)-180, 3(1990)-200, 4(1995)-60, 5(2000)-20; NO2 points: 1(1980)-70, 2(1985)-75, 3(1990)-75, 4(1995)-100, 5(2000)-140; H2O2 points: 1(1980)-20, 2(1985)-30, 3(1990)-40, 4(1995)-60, 5(2000)-100.

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The graphs illustrate the size of the ozone hole in the Antarctic and three types of damaging gases, consisting of freon, NO2, and H2O2 , that destroyed the Antarctic ozone from 1980 to 2000.

Overall, it is evident that the size of the Antarctic ozone hole expanded more and more considerably. Notably, the figure for freon experienced a dramatic increase initially before falling, while the production of NO2 became the highest by the end of the 20 years.

Beginning with the size of the Antarctic ozone hole, there was a gradual increase. Its figure was approximately less than 50,000 square km in 1980. The number of square kilometres grew sharply to nearly 190,000 over 10 years. Additionally, there was a slight rise and a peak at nearly 230,000 in 2000.

In terms of production, the amount of freon started at 150,000 square km in 1980 before peaking at over 200,000 in 1985, and then experiencing a considerable drop to 20,000 square km in 2000. Subsequently, the square kilometres of NO2 witnessed a moderate gain to approximately 160,000 km, becoming the highest production on the list by the end of the period. Meanwhile, H2O2 underwent a slight upturn of nearly 20,000 km in 1990 and then jumped significantly until the end of the period.

Word Count: 213

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Overall Band Score

6.5

(+/- 0.5)

Vocabulary Complexity:
B2 - Upper Intermediate
Opt for even more advanced words when appropriate.

Grammar Mistakes: N/A

Vocabulary Repetition:

square: 5

ozone: 4

antarctic: 4

freon: 3

production: 3

nearly: 3

Try using synonyms for the above words

Task Response

The report addresses the main trends and provides a clear overview of the data. However, there is a significant issue with the use of units. The student frequently confuses 'thousand metric tonnes' (the unit for gas production) with 'square kilometers' (the unit for the ozone hole size). For example, the report describes the production of Freon and NO2 in 'square km'. This inaccuracy affects the clarity of the data presentation. To improve, ensure that the correct units are strictly applied to the corresponding variables. Additionally, while the trends are generally well-described, more careful attention to the specific values provided in the visual description would enhance the accuracy of the report.

Coherence & Cohesion

The report is logically organized with a clear introduction, overview, and body paragraphs. The use of cohesive devices such as 'Overall', 'Notably', 'Beginning with', and 'In terms of' helps guide the reader through the comparison. However, some transitions between sentences could be smoother to achieve a more natural flow. To improve, try to use more varied linking words and ensure that the relationship between different trends is more explicitly stated through comparative structures.

Lexical Resource

The vocabulary used is generally appropriate for describing trends (e.g., 'expanded', 'dramatic increase', 'moderate gain', 'upturn'). However, there is a significant error in word choice regarding units: the report repeatedly uses 'square km' to describe the production of gases (Freon, NO2, H2O2), which is a unit of area, not mass/weight. This creates confusion. Additionally, ensure consistent capitalization for chemical names if they are treated as proper nouns in the context. To improve, pay close attention to the units provided in the axes of the graphs to ensure they are applied correctly to the corresponding data.

Grammatical Range & Accuracy

The report demonstrates a good range of grammatical structures, including complex sentences and various tense usages. There is a good use of participle clauses (e.g., 'before falling', 'becoming the highest'). There are some minor issues with phrasing and preposition usage, but they do not impede communication. To reach a higher band, focus on precision in sentence construction and ensure that the mathematical descriptions (e.g., 'approximately less than') are not redundant or contradictory.

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