Numerical answer
Five sentences related to a topic are given below. Four of them can be logically ordered to form a coherent paragraph; one does not fit. Identify the sentence number that does not belong.
1. Permafrost, ground that remains frozen for at least two consecutive years, underlies roughly a quarter of the land area in the Northern Hemisphere.
2. As global temperatures rise, permafrost is thawing at accelerating rates across the Arctic, releasing long-frozen organic material.
3. Arctic tourism has grown substantially in the past decade as travellers seek out increasingly accessible polar landscapes.
4. This organic material decomposes upon thawing, releasing methane and carbon dioxide that were previously locked away for millennia.
5. The resulting emissions create a feedback loop in which permafrost thaw itself contributes further to the warming that causes it.
1. Permafrost, ground that remains frozen for at least two consecutive years, underlies roughly a quarter of the land area in the Northern Hemisphere.
2. As global temperatures rise, permafrost is thawing at accelerating rates across the Arctic, releasing long-frozen organic material.
3. Arctic tourism has grown substantially in the past decade as travellers seek out increasingly accessible polar landscapes.
4. This organic material decomposes upon thawing, releasing methane and carbon dioxide that were previously locked away for millennia.
5. The resulting emissions create a feedback loop in which permafrost thaw itself contributes further to the warming that causes it.
Show answer and solution
Answer: 3
Sentences 1, 2, 4 and 5 form a coherent chain about permafrost thaw and its emissions feedback loop. Sentence 3, about Arctic tourism growth, is thematically related to the Arctic but does not fit the causal chain about permafrost and greenhouse gas emissions, so it is the odd one out.
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