1) Where does acid rain come from? a) Fossil fuels b) It is artificial c) Carbon dioxide emissions d) Internal combustion engines 2) How does acid rain form? | When moisture in the air is combined with... a) Oxides of nitrogen and sulfur dioxide b) Oxides of nitrogen and sulfur trioxide c) Antimony dioxide and carbon dioxide d) Sulfur dioxide and carbon dioxide 3) Where is acid rain most frequent? a) Spain b) China c) Murcia d) India 4) How does acid rain affect the environment? a) Aquatic ecosystems b) Lava rivers c) Bismuth productions d) Old and new buildings

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