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← HistoryWhich agricultural limit was reduced by the Incan system of terrace contour construction?
A)Topsoil erosion after rainfall✓
B)Transpiration rate under wind
C)Groundwater salinity upwelling
D)Blight vulnerability to monoculture
💡 Explanation
Terracing reduces water flow velocity on sloping land reducing erosion via flow dissipation. Therefore, topsoil erosion decreases, rather than exacerbating transpiration, salinity, or monoculture vulnerability because the slope's existing conditions dictate surface runoff amount unless mitigated via structural changes.
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