Question

Difficulty: MediumSingle-Sentence Inferences

Consider the following excerpt from a paleoclimatological study:

"While mid-Holocene lacustrine deposits in the Sahara were long thought to reflect widespread, uniform precipitation across North Africa, recent high-resolution isotopic analyses of speleothems in neighboring sub-Mediterranean caves demonstrate that humid episodes during this period were strictly seasonal and spatially compartmentalized."

Based on the excerpt above, evaluate whether the following statement is True or False:

Statement: High-resolution isotopic data from sub-Mediterranean speleothems indicate that humid periods in North Africa during the mid-Holocene were restricted to specific seasons rather than occurring uniformly throughout the year.

Answer: Answer

Answer

True. The sentence explicitly states that humid episodes were 'strictly seasonal,' which logically implies that precipitation during these periods was concentrated in specific seasons rather than evenly distributed year-round.
The claim accurately reflects the target sentence's explicit finding that mid-Holocene humid episodes were 'strictly seasonal.' In GMAT reading comprehension, 'strictly seasonal' directly supports the deduction that precipitation during these episodes occurred in specific seasons rather than uniformly throughout the year.

Step-by-Step Solution

1
Identify the key finding reported regarding the temporal distribution of rainfall in the target sentence.
The text states that isotopic analyses of speleothems demonstrate humid episodes were 'strictly seasonal.'
Isolating the explicit finding in the sentence is necessary to verify the deduction.
2
Compare the statement's claim with the textual evidence.
The statement asserts that humid periods were restricted to specific seasons rather than occurring uniformly throughout the year, which directly matches the meaning of 'strictly seasonal.'
A valid GMAT single-sentence inference must be strictly supported by explicit sentence modifiers without extrapolation.

Key Concept

Single-Sentence Inferences: Deductive reasoning based strictly on explicit modifiers within a single sentence.
Rate this question