What is associated with: candles can be made of animal fat or this nonglycerine substance used as early as 3000 bc?

Based on the clue 'candido rondon found the river of doubt now the ri...', what is the answer? What is referred to by 'candied brown betty'? Based on the clue 'candle in the wind singer who boldly signed the de...', what is the answer? Based on the clue 'candlemas celebrating the infant jesus being taken...', what is the answer? Based on the clue 'candling is a procees of running these over bright...', what is the answer? Based on the clue 'candling is a technique to inspect these', what is the answer? Based on the clue 'candling is the process of inspecting grading thi...', what is the answer? What is referred to by 'candor center canter'?