Information and IdeasMediumFinding supporting a glacial origin
Information and Ideas practice question
A geologist claims that the valley was carved by a glacier rather than by a river.
Which finding, if true, would most directly support the geologist's claim?
- A. The valley has a broad U-shaped cross-section, and its floor is scattered with boulders of a rock type found only 80 kilometres to the north.Correct
- B. A river runs along the valley floor today.
- C. The valley is more than 40 kilometres long.
- D. The valley's soil is unusually fertile.
Answer: A. The valley has a broad U-shaped cross-section, and its floor is scattered with boulders of a rock type found only 80 kilometres to the north.
A U-shaped profile and far-travelled boulders are classic signs of glacial carving and transport.
Why the other answers are wrong
- B. A river runs along the valley floor today.
- A present-day river doesn't show what carved the valley, and if anything points the other way.
- C. The valley is more than 40 kilometres long.
- Length doesn't distinguish glacial from river valleys.
- D. The valley's soil is unusually fertile.
- Fertility doesn't distinguish them either.
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