Which of the following pairs correctly contrasts a NATURAL and a HUMAN-MADE resource?
AAir (natural) — wind energy (human-made)
BIron ore (natural) — railway tracks (human-made)
CSolar radiation (natural) — solar radiation again (human-made)
DPetroleum (natural) — coal (human-made)
Answer & Solution
Correct answer: B. Iron ore (natural) — railway tracks (human-made)
Iron ore is a natural resource extracted from the earth; railway tracks are made from iron after processing — clearly human-made. Wind energy uses a natural resource (wind) but is captured by human-made turbines (so it's a hybrid). Solar radiation is purely natural. Petroleum and coal are BOTH natural (both fossil fuels) — pairing one against the other doesn't contrast natural vs human-made.
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