Crossword puzzle clue "underground oil source"

Here are the possible solutions for underground oil source clue

Answer
Clue
Relevancy
well
Clue
Underground oil source
aquifer
Clue
Underground water source
Underground source of water
Definition
an underground reservoir of water which can be extracted for surface use, also AQUAFER
ironore
Clue
Underground rock source
mine
Clue
Underground coal source
Underground source for coal
Underground gold source
Underground diamond source
Definition
to dig for valuable materials

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