Question: -  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 -   What might be the first step of the process?
Answer: Coal is burned

Question: -  Bacteria enters through the wound - The bacteria reproduces and spreads - Causes symptoms - The bacteria is either fought off or becomes a disease.  What might be the first step of the process?
Answer: Skin is cut or damaged

Question: -  The brain tells blood vessels to dilate - The sweat glands become active - Moisture is released from the pores - The moisture evaporates - The evaporation causes cooling.  What might be the first step of the process?
Answer: