Which new finding would most weaken the researchers' conclusion that terraces last only where people look after them?
For centuries, farmers in the Andes have built stone-walled terraces on steep slopes. A terrace turns a slope into a series of flat steps, which slows the run-off of rain and lets water soak into the soil instead of washing it away. The walls also absorb heat during the day and release it at night, which protects crops from frost. Some terraces are fed by narrow channels carrying meltwater from higher ground. Keeping them in order demands constant communal labour, and where villages have emptied, terraces have often collapsed within a few decades. Researchers therefore argue that the terraces are not only a farming technology but a social one: they last only where people organise to look after them.
Answer and explanation
Correct answer: C. Terraces in several abandoned villages were found fully intact after centuries without any repair
- Step 1: The conclusion says that terraces last only with communal care. Step 2. Intact terraces that were never repaired would show that care is not necessary. Answer: intact unrepaired terraces. Why not the others: The other findings are consistent with the claim that terraces need maintenance.
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