Crossword puzzle clue "rock used in fracking"

Here are the possible solutions for rock used in fracking clue

Answer
Clue
Relevancy
shale
Clue
Rock used in fracking
Fracking rock
tnt
Clue
Explosive used in fracking
Compound used in fracking
ecolaw
Clue
Anti-fracking legislation, e.g.
epa
Clue
Org. concerned with fracking
erob
Clue
Fracking opening
gas
Clue
Natural ___ (subject of "fracking" in 2012)
Definition
a state of matter

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