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Information and IdeasHardInference about a glacier's rocks

Information and Ideas practice question

Rocks of a type found only in the northern mountains lie scattered across the lowland plain 200 kilometres to the south, far from any river that could have carried them. Geologists infer that the plain was once ____

Which choice most logically completes the text?

  1. A. covered by ice that flowed from the northern mountains and dropped the rocks as it melted.Correct
  2. B. a mountain range of the same kind as the northern one.
  3. C. the bed of a river flowing north.
  4. D. free of any rocks at all.

Answer: A. covered by ice that flowed from the northern mountains and dropped the rocks as it melted.

No river; ice is the carrier.

Why the other answers are wrong

B. a mountain range of the same kind as the northern one.
The rocks are from the north, not native.
C. the bed of a river flowing north.
The text rules out rivers.
D. free of any rocks at all.
Nothing suggests an absence of rocks.

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