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Expression of IdeasHardReconciling two conflicting measurements

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A 1900 survey recorded the lake's depth as 48 metres. - A 2020 survey recorded it as 41 metres. - Both surveys measured at the same marked point. - The lake's inflow carries heavy silt from a quarry that opened in 1950. The student wants to explain the difference between the two measurements.

Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. The lake has lost 7 metres of depth at the same point since 1900, most likely because silt from the quarry that opened in 1950 has settled on the bottom.Correct
  2. B. The 1900 survey recorded a depth of 48 metres.
  3. C. Both surveys measured at the same marked point.
  4. D. A quarry opened in 1950.

Answer: A. The lake has lost 7 metres of depth at the same point since 1900, most likely because silt from the quarry that opened in 1950 has settled on the bottom.

The difference, and the silt that explains it.

Why the other answers are wrong

B. The 1900 survey recorded a depth of 48 metres.
One figure.
C. Both surveys measured at the same marked point.
The method, no explanation.
D. A quarry opened in 1950.
The cause without the difference.

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