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Difficulty: MediumSubject-Modifier Agreement

Which noun logically completes the passage to ensure proper subject-modifier agreement?

Answer:A highly efficient method of heat transfer in fluids, 【convection】 occurs when warmer, less dense areas of a liquid or gas rise while cooler, denser areas sink. This process plays a vital role in atmospheric circulation and ocean currents.

Answer

convection
The introductory appositive phrase 'A highly efficient method of heat transfer in fluids' must modify a singular noun that describes a method of heat transfer. The noun 'convection' perfectly fits this description and serves as the subject of the clause.

Step-by-Step Solution

1
Analyze the introductory modifier of the sentence.
The phrase 'A highly efficient method of heat transfer in fluids' is a singular appositive noun phrase.
The noun that follows this modifier must be a singular concept representing a method of heat transfer in fluids to ensure correct grammatical agreement.
2
Determine the physical process described in the rest of the sentence.
The text describes a process where warmer, less dense areas rise and cooler, denser areas sink.
This description defines the physics concept of convection.
3
Combine the modifier and the correct noun to complete the sentence.
Inserting 'convection' immediately after the introductory phrase establishes proper subject-modifier agreement.
Since 'convection' is a singular noun representing this specific method of heat transfer, it correctly agrees with the introductory modifier.

Key Concept

Subject-Modifier Agreement
Estimated Time:1m 0s
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Subject-Modifier Agreement

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