Crossword puzzle clue "it's crude then refined"

Here are the possible solutions for it's crude then refined clue

Answer
Clue
Relevancy
gas
Clue
It's crude, then refined
Refined crude
Definition
a state of matter
fordfiestaccato
Clue
Hybrid car that runs a few seconds, then stops, then runs again, then stops again...?
oil
Clue
It may be crude or refined
It can be crude or refined
Definition
to lubricate with a greasy substance
alternate
Clue
Do this, then that, then this again
Definition
in turns
eden
Clue
Place whose population was 1, then 2, then 0
erst
Clue
Back then, back then
Definition
formerly, also EARST

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