Percentage of Pollutants Entering a Section of Ocean in 1997 and 2007

IELTS Academic Writing Task 1 - Pie Charts
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IELTS Writing Task 1 Question

111. The two pie charts show the percentage of pollutants entering a particular part of ocean in 1997 and 2007.

Common questions for the pie charts

1. Graph Type: Pie Charts

2. Title: Percentage of Pollutants Entering a Section of Ocean in 1997 and 2007

3.  What are the units of measurement?: Percentage

4. Who: Sources of pollutants entering a section of the ocean

5. When: 1997 and 2007

6. Where: A particular section of the ocean

7. Topic: Distribution of pollutants from various sources over a decade

Process Showing and Trends

Comparison 1 : 1997 pollutants

• Details:

1.  The largest sources were air pollutants (30%) and domestic sewage (18%).
2.  Offshore oil contributed 5%, and litter was at 4%.
3.  Farm waste and marine activities had a minor share, at 4% and 17%, respectively.

Comparison 2 : 2007 pollutants

• Details:

1.  Significant increase in domestic sewage, rising to 29%.
2.  Offshore oil rose to 14%, nearly threefold compared to 1997.
3.  Pollution from air remained stable at around 30%.
4.  Decreases were observed in industrial waste (from 20% to 12%) and marine activities (from 17% to 12%).
5.  Farm waste fell to 2%, and litter was no longer present.

Sample Answer

The two pie charts illustrate the distribution of pollutants entering a specific ocean region in 1997 and 2007.

In 1997, air pollutants were the major contributor at 30%, closely followed by domestic sewage (18%) and industrial waste (20%). Marine activities accounted for 17%, and smaller percentages came from offshore oil (5%), farm waste (4%), and litter (4%).

By 2007, notable changes were evident. Domestic sewage increased significantly to 29%, and offshore oil pollution saw a substantial rise to 14%. The proportion of pollutants from the air remained consistent at about 30%. Conversely, industrial waste and marine activities both experienced decreases, falling to 12% each. Farm waste declined by half, reaching 2%, and litter disappeared entirely from the recorded pollutants.

Overall, the most significant changes over the ten-year period were the increase in pollution from domestic sewage and offshore oil, while industrial and marine waste contributions decreased. The data highlight shifts in pollution sources affecting this part of the ocean between 1997 and 2007

Top 29 Vocabularies

 

Vocabulary  Meaning Synonyms Examples

Type

Contributor 

A source or cause of something

Source, factor

“Air pollutants were the major contributor in 1997.”

Noun

Substantial 

Significant in amount

Considerable, notable

“Offshore oil pollution saw a substantial rise by 2007.”

Adjective

Consistent 

Remaining the same over a period

Unchanging, steady

“The proportion of air pollution remained consistent over the decade.”

Adjective

Decline 

To decrease or reduce

Drop, decrease

“Industrial waste saw a decline from 20% to 12%.”

Verb

Highlight

To emphasize or point out

Emphasize, showcase

“The data highlight shifts in pollution sources over the years.”

Verb

Illustrate

To explain or clarify something using examples or visuals

Demonstrate, depict

“The charts illustrate the pollution distribution.”

Verb

Distribution

The way in which something is spread or shared

Allocation, dispersal

“The distribution of pollutants changed over time.”

Noun

Pollutant

A substance that contaminates the environment

Contaminant, impurity

“Air pollutants were a major source in 1997.”

Noun

Marine

Related to the sea or ocean

Oceanic, aquatic

“Marine activities contributed to pollution levels.”

Adjective

Offshore

Situated at sea but near land

Coastal, maritime

“Offshore oil pollution increased significantly.”

Adjective

Proportion

A part or share of a whole

Percentage, fraction

“The proportion of industrial waste declined by 2007.”

Noun

Evident

Clearly seen or understood

Obvious, noticeable

“Notable changes were evident between 1997 and 2007.”

Adjective

Significant

Important or notable

Substantial, considerable

“There was a significant rise in domestic sewage.”

Adjective

Reduction

The act of making something smaller in amount

Decrease, decline

“Marine activities saw a reduction in pollution levels.”

Noun

Contribution

The act of adding or supplying something

Input, addition

“Industrial waste made a smaller contribution in 2007.”

Noun

Environmental

Relating to the surroundings or ecosystem

Ecological, natural

“Pollution impacts the environmental balance of oceans.”

Adjective

Notable

Worthy of attention or importance

Remarkable, noteworthy

“Offshore oil saw a notable increase over the years.”

Adjective

Steady

Regular, constant, or stable

Consistent, unchanging

“Air pollution levels remained steady across the years.”

Adjective

Emerge

To come into view or become apparent

Appear, develop

“New sources of pollution began to emerge.”

Verb

Increase

To become greater in size or amount

Rise, grow

“There was a sharp increase in offshore oil pollution.”

Verb

Decline

A gradual decrease or reduction

Drop, fall

“Farm waste pollution declined by half over the years.”

Noun/Verb

Disappearance

The act of something ceasing to exist or be visible

Vanishing, extinction

“Litter pollution saw complete disappearance in 2007.”

Noun

Fluctuate

To change irregularly

Vary, oscillate

“Pollutant levels fluctuated over the decade.”

Verb

Comparison

The act of evaluating similarities and differences

Contrast, evaluation

“A comparison of the data shows pollution trends.”

Noun

Trend

A general direction in which something is developing

Pattern, tendency

“A downward trend was seen in industrial waste levels.”

Noun

Majority

More than half of something

Bulk, most

“The majority of pollutants came from air sources.”

Noun

Minor

Of lesser importance or smaller in size

Slight, small

“Farm waste played a minor role in pollution levels.”

Adjective

Contamination

The process of making something impure

Pollution, infection

“Water contamination increased due to sewage discharge.”

Noun

Impact

The effect or influence of one thing on another

Effect, consequence

“The impact of offshore oil pollution was substantial.”

Noun
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