When coal is burned, mineral impurities are converted to A) ...

[Mimi]

When coal is burned, mineral impurities are converted to
 
  A) sulfur dioxide gas that goes up the smokestack.
  B) carbon dioxide and water.
  C) metal oxide solids that remain behind as ash.
  D) All of the above are products of burning coal.

Question 2

Approximately what percentage of U.S. electricity is generated by the burning of coal?
 
  A) 25
  B) 35
  C) 45
  D) 65

[ebe]

Answer to Question 1

C

Answer to Question 2

C

[Mimi]

Thanks for the timely response, appreciate it

[xiaomengxian]

Excellent