Potential answers for "Rock source of fuel"

⭐⭐⭐⭐ OILSHALE
⭐⭐ ETHANOL
⭐⭐ PEATBOG
⭐⭐ MAGMA
⭐⭐ GASPUMP
⭐⭐ LAVA
⭐⭐ COALMINE
⭐⭐ SHALE

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