Information and IdeasMediumFinding supporting a claim about a glacier's retreat
Information and Ideas practice question
A climatologist claims that the glacier has retreated substantially over the past century.
Which finding, if true, would most directly support the climatologist's claim?
- A. A photograph taken from a fixed viewpoint in 1920 shows the glacier's snout two kilometres further down the valley than a photograph from the same viewpoint taken in 2020.Correct
- B. The glacier is a popular destination for hikers.
- C. A river flows out of the valley below the glacier.
- D. The glacier is one of dozens in the mountain range.
Answer: A. A photograph taken from a fixed viewpoint in 1920 shows the glacier's snout two kilometres further down the valley than a photograph from the same viewpoint taken in 2020.
Matched photographs a century apart showing the snout two kilometres higher up the valley are direct evidence of retreat.
Why the other answers are wrong
- B. The glacier is a popular destination for hikers.
- Popularity says nothing about the glacier's size.
- C. A river flows out of the valley below the glacier.
- Glaciers commonly feed rivers; this doesn't show change.
- D. The glacier is one of dozens in the mountain range.
- Being one of many says nothing about retreat.
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