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Difficulty: HardVocabulary-in-Context

In her 1892 reassessment of alpine glaciology, geologist Ellen Semple challenged the prevailing assumption that glacial retreat was driven exclusively by macroscopic thermal shifts. Investigating the micro-climatic gradients along the margins of retreating ice sheets, Semple posited that localized vapor pressure differentials exerted a far more immediate influence on ice ablation than regional temperature averages implied. To demonstrate this mechanism, she devised an intricate experimental apparatus to tax the moisture-absorption capacity of surrounding rock formations under controlled atmospheric pressures. Where her contemporaries viewed subterranean absorption as a static background parameter, Semple recognized that the rock's porous matrix actively drained humidity from the boundary layer, accelerating local evaporation. Though initially dismissed by established mineralogists who regarded micro-climatic factors as negligible, Semple’s meticulous readings provided the foundational framework for modern micro-glaciology.

In the context of the passage, which of the following best captures the meaning of the word "tax" as used in the third sentence?

  1. A
    assess financially
  2. strainAnswer
  3. C
    irreparably exhaust
  4. D
    artificially augment
  5. E
    measure precisely

Answer

In the context of the passage, the word 'tax' most nearly means strain.
In academic prose, the verb 'tax' frequently carries the secondary meaning of placing a heavy demand on, putting to the test, or straining a resource or capacity. The passage describes Semple subjecting the rock's moisture-absorption capacity to controlled pressure within an experimental apparatus, thereby straining or testing its functional limit.

Step-by-Step Solution

1
Locate the target word in the passage and analyze its immediate grammatical context.
The phrase reads: 'devised an intricate experimental apparatus to tax the moisture-absorption capacity of surrounding rock formations under controlled atmospheric pressures.'
Understanding the subject and object of the verb clarifies what action is being performed upon the 'capacity'.
2
Derive the contextual meaning of the target word using surrounding narrative clues.
Semple is subjecting the rock's absorption capacity to controlled atmospheric pressure to see how much humidity it can actively drain under demanding conditions.
The sentence establishes an experimental setup designed to challenge or press the physical limits of the rock's porosity.
3
Evaluate the choices to find the closest secondary definition matching this functional context.
'Strain' means to put severe demands on or test to the limit, matching the contextual function of 'tax'.
Common dictionary definitions (like financial levies) must be rejected in favor of the secondary usage indicating physical demand or stress.

Key Concept

Secondary definitions of polysemous words in academic context
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Topics

Vocabulary-in-Context

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