Crossword puzzle clue "possible source of petroleum"

Here are the possible solutions for possible source of petroleum clue

Answer
Clue
Relevancy
shale
Clue
Possible source of petroleum
Petroleum source
oildeposit
Clue
Underground petroleum source
oilsand
Clue
Alberta petroleum source
dalailama
Clue
Spiritual leader who said, "Be kind whenever possible. It is always possible."
amicuscuriae
Clue
Possible legal-brief source
bismarck
Clue
"Politics is the art of the possible" source
Definition
(Canadian) a type of pastry
caesarsalad
Clue
Possible source of salmonella poisoning

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