You are presented with the quiz "Solid materials used to produce electricity by burning in what need to be transported firs" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "coal is used to produce electricity by burning in coal-fire power stations" and "solid refined coal is easy to transport and can be used in coal-burning equipment". 

So, what's the best answer to the question?


 

       power stations    