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Difficulty: MediumCorroborating Claims Across Sources

Review the two informational sources below regarding the rehabilitation of ancestral agricultural terraces (*andenes*) in Peru's Colca Valley:

Source 1: Excerpt from an Audio Broadcast (Interview with Agronomist Dr. Lucía Quispe, Arequipa Regional Institute)
*Dr. Quispe:* "When we rebuild the stone retaining walls and re-establish the traditional tiered soil strata in the Colca Valley, we see an immediate hydrological benefit. The permeable stone masonry slows downhill runoff during heavy cloudbursts, allowing rainwater to infiltrate deeply into the topsoil rather than washing nutrients down the canyon. While our field teams face shortages of skilled stonemasons due to rural migration, the rehabilitated terraces consistently safeguard crops against seasonal moisture deficits."

Source 2: Excerpt from a Technical Evaluation Report (Andean Agricultural Foundation)
"A three-year agronomic assessment in the Cabanaconde district reveals that active terrace (*andén*) systems increase soil moisture retention by 34% compared to unmanaged hillsides. The stepped topography and porous stone barriers capture intermittent precipitation, creating a stable microclimate that protects native maize and potato varieties from prolonged drought. Long-term structural preservation, however, relies heavily on community labor cooperatives (*ayllu* workdays) to clear drainage channels after seasonal rains."

Which finding regarding restored agricultural terraces is corroborated by both sources?

  1. A
    Shortages of specialized masonry labor represent the primary obstacle preventing the expansion of terrace restoration.
  2. The physical structure of the stone terraces enhances soil moisture retention and buffers crops against drought conditions.Answer
  3. C
    Community labor cooperatives are established primarily to finance the initial masonry construction of the terraces.
  4. D
    Restored terrace systems completely remove the reliance of native Andean crops on seasonal precipitation.

Answer

The statement confirming that the physical structure of the stone terraces enhances soil moisture retention and buffers crops against drought conditions is supported by both sources.
The correct response accurately synthesizes the shared conclusion of both documents: the audio source notes that permeable stone masonry allows rainwater to infiltrate deeply and safeguard crops against moisture deficits, while the print report demonstrates that the stepped stone barriers increase moisture retention by 34% and protect crops from drought.

Step-by-Step Solution

1
Analyze Source 1 (audio transcript excerpt) for core factual claims.
The agronomist emphasizes that the stone masonry slows runoff, increases deep soil infiltration, and safeguards crops against seasonal moisture deficits, while mentioning mason shortages.
Identifying the distinct claims in the first source provides a baseline for cross-source comparison.
2
Analyze Source 2 (technical report excerpt) for core factual claims.
The report highlights a 34% increase in soil moisture retention due to porous stone barriers and stepped topography protecting against drought, while noting the role of community labor in channel maintenance.
Extracting empirical findings from the second source allows direct comparison with the first source.
3
Identify the overlapping, corroborated claim present in both texts.
Both sources corroborate that terrace architecture improves soil water retention and shields agricultural crops from moisture shortages.
Corroboration requires mutual support from both pieces of evidence rather than reliance on single-source details.

Key Concept

Cross-Source Synthesis and Corroboration of Empirical Claims

Alternative Method

Isolate the primary hydrological and agricultural effects described in each excerpt into a brief two-column mental checklist, eliminating any answer choice that appears in only one column.
Estimated Time:1m 30s
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Corroborating Claims Across Sources

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