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Craft and StructureEasyMain purpose of an explanation of a recurring phenomenon

Craft and Structure practice question

Frost pushes rocks up out of the soil. Water in the ground freezes and expands, lifting the rocks; when the ice melts, soil settles into the space beneath them, so they cannot sink back. That is why farmers in cold regions clear a fresh crop of stones from the same fields every spring.

What is the main purpose of the text?

  1. A. To explain why stones keep appearing in fields in cold regions.Correct
  2. B. To argue that farming in cold regions is not worthwhile.
  3. C. To describe the tools farmers use to clear stones.
  4. D. To compare frost in cold regions with frost in mild ones.

Answer: A. To explain why stones keep appearing in fields in cold regions.

Mechanism first, then the puzzle it solves: fresh stones every spring. The text explains a recurring phenomenon.

Why the other answers are wrong

B. To argue that farming in cold regions is not worthwhile.
The text describes a chore, not a verdict on farming.
C. To describe the tools farmers use to clear stones.
No tools are described.
D. To compare frost in cold regions with frost in mild ones.
Only cold regions are discussed.

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