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← HistoryWhich planting consequence results when pre-Columbian chinampas lack routine maintenance?
A)Nutrient runoff eutrophication of waterways
B)Declined maize yields fungal diseases
C)Subsidence compaction increased erosion✓
D)Increased salinity reduced crop diversity
💡 Explanation
Subsidence and compaction increase drastically because decreased structural cohesion impairs drainage and support, and therefore the island sinks rather than maintaining elevation, leading to crop failure and land loss under persistent waterlogged conditions.
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