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Difficulty: HardInferences and Implicit Meaning

In his 1706 treatise on the physical state of the sea, Italian polymath Luigi Ferdinando Marsigli investigated the persistent hydrodynamical puzzle of the Strait of Gibraltar: despite a continuous surface inflow of Atlantic water into the Mediterranean, the water level of the Mediterranean basin did not rise indefinitely. Prevailing hypotheses attributed this equilibrium almost exclusively to atmospheric evaporation. Marsigli, however, postulated an opposing deep countercurrent returning water to the Atlantic. To test this, he constructed a dual-compartment tank divided by a partition, filling one side with dense, highly saline water to simulate the Mediterranean and the other with less dense water to simulate the Atlantic. Opening apertures at both top and bottom revealed a two-way circulation: lighter water moved surface-wise toward the denser side, while denser water flowed along the bottom in the opposite direction. Although Marsigli argued that density differentials caused by salinity and temperature drove submarine currents, his contemporaries broadly rejected his countercurrent hypothesis. This resistance arose largely because seventeenth- and early eighteenth-century natural philosophers viewed the abyssal ocean as a quiescent, homogenous realm, isolated from the thermal and saline variations that affected surface waters.

It can be inferred from the passage that many natural philosophers in the early eighteenth century rejected Marsigli's countercurrent hypothesis because they

  1. A
    assumed that laboratory scale models were fundamentally incapable of replicating the hydrodynamic behaviors of natural maritime bodies
  2. held a conception of deep ocean environments that was incompatible with the mechanism of density-driven submarine circulationAnswer
  3. C
    believed that atmospheric evaporation was entirely insufficient to maintain the water level equilibrium of the Mediterranean Sea
  4. D
    maintained that surface winds were the sole mechanism regulating fluid dynamics across all major maritime straits
  5. E
    vehemently denied that salinity and temperature could influence fluid density under any circumstances

Answer

held a conception of deep ocean environments that was incompatible with the mechanism of density-driven submarine circulation
The correct option accurately reflects the logical link in the passage. Marsigli's model required density differences driven by temperature and salinity variations to generate deep currents. However, natural philosophers of his era believed the deep ocean was static and isolated from such variations. Consequently, their understanding of the deep ocean environment inherently precluded the mechanism Marsigli proposed.

Step-by-Step Solution

1
Locate the passage context discussing why contemporaries rejected Marsigli's hypothesis.
The final sentence states: 'This resistance arose largely because seventeenth- and early eighteenth-century natural philosophers viewed the abyssal ocean as a quiescent, homogenous realm, isolated from the thermal and saline variations that affected surface waters.'
Inference questions require extracting the unstated implication directly supported by specific lines in the text.
2
Analyze Marsigli's proposed mechanism versus the view of his contemporaries.
Marsigli proposed that density differentials (caused by temperature and salinity variations) drove deep currents. His contemporaries believed the deep ocean was homogeneous and isolated from such variations.
If deep waters lack temperature and saline variations, density-driven currents cannot form under Marsigli's framework.
3
Synthesize the logical connection to identify the valid inference.
Because contemporaries believed the deep sea was uniform and isolated from thermodynamic changes, their belief system directly conflicted with the prerequisites of density-driven submarine movement.
The correct option rephrases this logical incompatibility directly without overstepping passage evidence.

Key Concept

Inferences and Implicit Meaning in Reading Comprehension
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Topics

Inferences and Implicit Meaning

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