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In a recent study of urban microclimates, meteorologists observed that every neighborhood in City M with a high concentration of high-rise glass buildings experiences a "heat island" effect, in which evening temperatures remain at least 3 degrees Celsius higher than those in surrounding rural areas. However, not all neighborhoods experiencing this heat island effect contain high-rise glass buildings; several historic districts comprised entirely of low-rise brick structures also record evening temperatures at least 3 degrees higher than the rural baseline. The study further noted that while high-rise glass buildings significantly reduce local wind speeds, these historic brick districts maintain wind speeds comparable to those in rural areas.

Which of the following is most strongly supported by the information above?

  1. A
    Most neighborhoods in City M that experience the heat island effect contain a high concentration of high-rise glass buildings.
  2. B
    In neighborhoods with high-rise glass buildings, the heat island effect is caused by the significant reduction in local wind speeds.
  3. C
    If a neighborhood in City M does not contain a high concentration of high-rise glass buildings, it will not experience a significant reduction in local wind speeds.
  4. A reduction in local wind speeds is not necessary for a neighborhood in City M to experience the heat island effect.Answer
  5. E
    Low-rise brick structures retain more daytime heat than do high-rise glass buildings, leading to elevated evening temperatures.

Answer

A reduction in local wind speeds is not necessary for a neighborhood in City M to experience the heat island effect.
The stimulus explicitly states that the historic brick districts experience the heat island effect while simultaneously maintaining wind speeds comparable to rural areas. Since these specific brick districts exhibit the heat island effect without any significant reduction in wind speeds, it logically follows that a reduction in wind speeds cannot be a necessary condition for the effect to occur.

Step-by-Step Solution

1
Identify the characteristics of the historic brick districts from the stimulus.
The text states they experience the heat island effect AND maintain wind speeds comparable to rural areas.
Tracking the specific attributes of different groups is essential for making valid deductions.
2
Analyze the relationship between the heat island effect and wind speeds in these brick districts.
Because these districts maintain rural wind speeds, they do not experience a significant reduction in local wind speeds.
This establishes a factual scenario where the heat island effect exists without reduced wind speeds.
3
Determine what this implies about necessary conditions.
If an effect can occur without a specific factor, that factor cannot be a necessary condition for the effect.
This is the core logical deduction required to find the most strongly supported statement.
4
Synthesize the findings to match the correct option.
A reduction in local wind speeds is not necessary for a neighborhood to experience the heat island effect.
This matches the deduction derived directly from the historic brick districts' data.

Key Concept

Synthesizing factual premises to deduce the absence of a necessary condition.
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