1a) State the chemicals responsible for ozone layer destruction

 1b)Name any two

  (i)Natural sources of atmospheric pollution

  (ii)Gases which are responsible for the formation of acid rain

 1(c) Explain the term global warming.State two ways by which global warming can be reduced.

 1(d)State two effects of ozone depletion

1a) nitrogen dioxide and nitrogen trioxide , Chlorine monoxide.

1b)

(i)Volcanic eruptions,Decay of vegetable matter and animals

(ii)SO_{2 ,}  NO2

1c)

Global warming is excess accumulation of greenhouse gases such as carbon dioxide, methane, nitrous oxide, ozone and chlorofluorocarbon (CFC) that causes warming of the Earth.

Two ways in which global warming can be reduced:

• Plant more trees to increase the green cover.
• Avoid burning of dry leaves, wood etc. Avoid smoking.

1d) Two effects of ozone depletion:

1.  Ozone is a poisonous gas. It causes respiratory problems.

2.  It damages vegetation (plants and trees).

3.  It causes damage to automobile tyres and asphalt.