Explain the phenomena of :
(a) Acid rain, (b) Global warming.

A- Acid rain: Burning of fossil fuels release oxides of Sulphur, and nitrogen into the air. Nitogen gets oxidized and forms its oxides. These chemicals fall along with rainwater on earth thus causing acid rain.

B- Global Warming: Global warming refers to an increase in earth’s temperature due to effect of greenhouse gases like carbon dioxide and methane. These gases traps the infrared rays and doesn’t let them escape out from the earth’s surface which results in an increase in earth’s temperature as all the heat gets trapped in. This causes global warming.