Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


It is called black gold because when  we we dig it out ,it is black in colour.
it is worth a lot of money.
i hope this helps u...
0 0 0
Because it black in colour and it is precious as gold .it should conserve.so,petroleum is called black gold

0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts