Numerical answer
Arrange the following sentences (1-5) in the correct logical order to form a coherent paragraph. Enter your answer as the sequence of numbers, e.g. 24153.
1. This has practical implications for aviation: aircraft flying eastward across the Atlantic or Pacific often route themselves to ride the jet stream deliberately, cutting fuel consumption and flight time considerably.
2. Jet streams are narrow bands of fast-moving air found in the upper atmosphere, formed where large temperature differences between adjacent air masses create strong pressure gradients.
3. Conversely, westbound flights try to avoid the same current, since flying against it can add well over an hour to a long-haul journey.
4. The strongest of these, the polar jet stream, typically flows from west to east and can reach speeds exceeding 400 kilometres per hour at cruising altitude.
5. Meteorologists monitor its exact position closely, since it shifts from day to day and even season to season, influencing not just aviation but also regional weather patterns below it.
1. This has practical implications for aviation: aircraft flying eastward across the Atlantic or Pacific often route themselves to ride the jet stream deliberately, cutting fuel consumption and flight time considerably.
2. Jet streams are narrow bands of fast-moving air found in the upper atmosphere, formed where large temperature differences between adjacent air masses create strong pressure gradients.
3. Conversely, westbound flights try to avoid the same current, since flying against it can add well over an hour to a long-haul journey.
4. The strongest of these, the polar jet stream, typically flows from west to east and can reach speeds exceeding 400 kilometres per hour at cruising altitude.
5. Meteorologists monitor its exact position closely, since it shifts from day to day and even season to season, influencing not just aviation but also regional weather patterns below it.
Show answer and solution
Answer: 24135
Sentence 2 defines jet streams generally. Sentence 4 narrows to the polar jet stream, giving its direction and speed. Sentence 1 gives the first aviation consequence (eastbound flights ride it). Sentence 3 follows directly, since 'Conversely' contrasts the westbound case with the eastbound case just described in 1. Sentence 5 closes the paragraph with a broader generalisation (the jet stream shifts and affects weather beyond aviation). The order is therefore 2-4-1-3-5.
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