Concept:Sulphur (IV) oxide is a pollutant that affects the environment mainly through the formation of acidic moisture in the atmosphere.
Explanation:Sulphur (IV) oxide (
SO2) is released from burning fossil fuels and industrial processes.
When
SO2 mixes with water vapour and oxygen in the air, it forms sulphuric acid (
H2SO4).
This acid falls to the ground as rain, mist, or snow.
Such acidic precipitation is called acid rain.
Acid rain damages trees, plants, aquatic life, buildings, and soil.
Therefore, the environmental problem caused by
SO2 is acid rain, not deforestation, global warming, or erosion.
Answer:A. acid rain