Why was petroleum called “black gold”

The folsom culture was replaced by the plano culture. clovis culture. american indian culture. paleo-indian culture.

What from the columbian exchange had perhaps the biggest impact on the world?

What was one of the main accomplishments of louis ix? a) he was made a saint after his death b) he eliminated trials by jury. c) he called the first french parliament. d) he ended the taxation system.