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Difficulty: Very hardStrengthening or Weakening Author Assertions

Passage:
Historians of Mesoamerican agriculture have long debated the factors underlying the abandonment of lowland Maya urban centers during the Terminal Classic period (c. 800800–900900 CE). Traditional hypotheses emphasized environmental degradation, proposing that intensive terrace farming on hillside slopes triggered catastrophic topsoil erosion and nutrient depletion, rendering agricultural hinterlands incapable of supporting dense populations. Recently, however, agro-ecologist Elena Vasquez proposed a revised model: rather than hillside terracing, it was the widespread reliance on lowland wetland agricultural systems—specifically *chinampa*-style raised fields constructed in seasonal swamps—that constituted the primary vulnerability. Vasquez contends that raised-field agriculture required precise, continuous labor input to clear silted canals and maintain water table levels. According to her model, a series of severe multi-year droughts disrupted regional hydrologic regimes, causing water tables to drop below canal beds. This led not to gradual soil exhaustion, but to an immediate, systemic collapse of crop yields across wetland networks, forcing urban abandonment.

To support her assertion that raised fields were the critical failure point, Vasquez points to sediment core samples from lowland basin lakes showing an abrupt drop in *Zea mays* (maize) pollen coinciding precisely with initial drought indicators, whereas terrace-adjacent sediment deposits display a far more gradual decline in agricultural activity.

Question:
Which of the following findings, if true, would most seriously weaken Elena Vasquez's assertion regarding the primary vulnerability that caused the collapse of lowland Maya urban centers?

  1. Sediment cores from hillside terraces reveal that extensive topsoil erosion and severe nutrient depletion occurred several decades prior to the multi-year droughts, coinciding with the earliest recorded urban population declines.Answer
  2. B
    Hydrologic simulations of lowland swamp networks demonstrate that even minor drops in the regional water table render raised-field canals functionally useless within a single agricultural season.
  3. C
    Highland Maya urban settlements that relied exclusively on rainfall-fed mountain terracing maintained stable population densities for more than a century after lowland cities were abandoned.
  4. D
    Paleoclimate data indicate that the severity and duration of multi-year droughts during the Terminal Classic period varied significantly across different sub-regions of the Maya lowlands.
  5. E
    Archaeological excavations reveal that the construction of *chinampa*-style raised fields required substantially more labor per hectare than the initial building of hillside agricultural terraces.

Answer

The statement showing that hillside terrace erosion and nutrient exhaustion occurred decades prior to the droughts, coinciding with the earliest population declines, most seriously weakens Vasquez's assertion.
The correct option provides empirical evidence that hillside terrace degradation occurred decades before the droughts and directly coincided with the onset of urban decline. This demonstrates that terrace failure—the traditional hypothesis Vasquez attempts to displace—was actually the primary catalyst for population loss, thereby directly undermining her argument that raised fields were the critical vulnerability.

Step-by-Step Solution

1
Identify the author/researcher's specific assertion and central premise.
Vasquez asserts that reliance on wetland raised fields (not hillside terraces) was the primary agricultural vulnerability causing urban collapse when drought struck.
To weaken an assertion, one must identify its core vulnerability or premise.
2
Evaluate the evidence Vasquez uses to support her assertion.
Vasquez relies on the timing of maize pollen loss in basin lakes versus terrace sediment deposits to claim raised fields failed first and caused urban abandonment.
Weakening evidence usually involves showing an alternative cause or demonstrating that the counter-hypothesis occurred earlier and drove the outcome.
3
Assess the impact of each answer choice on the causal relationship.
Evidence that terrace failure occurred decades earlier and matched the initial population drop proves terrace erosion was the primary catalyst, directly undermining Vasquez's claim that raised fields were the principal failure point.
Establishing prior temporal sequence and causation for the competing theory invalidates the claim that raised-field failure was the primary driver.

Key Concept

Weakening Author Assertions in Reading Comprehension
Estimated Time:2m 30s
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Topics

Strengthening or Weakening Author Assertions

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