Task: Question Answering
Input (English): Process:  -Coal is burned -Sulfur in the coal combines with oxygen to form sulfur oxides -The sulfur oxides are released into the atmosphere -The sulfides combine with oxygen in the atmosphere to form sulfur trioxide -The sulfur trioxide reacts with water in the atmosphere to form sulfuric acid, a very strong acid -The sulfuric acid makes the rain acidic -
 Question: What is the effect of the ice tray is filled in the freezer on less sulfur trioxide forms.?
Output (English): none