Based on the clue 'crude oil can be extracted from this rock the most...', what is the answer?

What is referred to by 'crt'? Based on the clue 'crucibles are sometimes made out of this ceramic m...', what is the answer? Based on the clue 'cruciform means built in this shape like the inter...', what is the answer? Based on the clue 'crude incendiary grenade with a russian name thats...', what is the answer? Based on the clue 'crudely fashioned verse often of a humorous nature', what is the answer? Based on the clue 'crudites are generally served with this 3 letter i...', what is the answer? What is referred to by 'cruel guitar'? Based on the clue 'cruella de vil was the villainess who kidnapped th...', what is the answer?