1. © Oxford University Press 2008 Many power stations burn coal containing sulfur. The sulfur reacts with oxygen and produces acidic sulfur oxides. 5.7 Acid rain What causes acid rain?

2. © Oxford University Press 2008 Cars and lorry engines produce nitrogen oxides. 5.7 Acid rain But what happens to the nitrogen and sulfur oxides produced by these processes?

3. © Oxford University Press 2008 Sulfur and nitrogen oxides react with water and oxygen in the atmosphere. This forms sulfuric acid and nitric acid. These fall to Earth as acid rain. 5.7 Acid rain What causes acid rain?

4. © Oxford University Press 2008 Fish can die when the pH of the lake they live in becomes too low. Trees and lakes are badly affected. 5.7 Acid rain What problems can acid rain cause?

5. © Oxford University Press 2008 … and reacts with limestone in buildings and statues to wear the limestone away. Acid rain increases the corrosion of metals… 5.7 Acid rain