Addition of hazardous wastes in envoirnment will lead to contamination of habitat.

 Global warming cannot increase the agricultural yield, rather it will be affected adversely.

 Ozone layer prevents ultravoilet rays from reaching earth's surface. Depletion of ozone layer will lead to increased amount of UV raus reaching earth's surface.

 CFCs are responsible for causing depletion of ozone layer. It does not cause greenhouse effect.

 Burning of fossil fuels releases a lot of pollutants into the atmosphere like sulphur dioxide, carbon dioxide, etc., which have various environmental effects. Hence, air is polluted.

 Nitrogen and oxygen are the main components of the atmosphere by volume. Together these two gases make up approximately 99% of the dry atmosphere. But Nitrogen is present in the highest concentration(78.08%).

 Nitrogen gas is trapped by leguminous plants. It can take free nitrogen from air.

 Manmade chemicals like chlorofluorocarbons is the major depleters of the ozone layer. It is  manufactured for the purposes of refrigerant or aerosol propellant. 

 Two gases which contribute to acid rain are  

1. SO2 (sulfur dioxide) will make sulphuric acid.
2. NOx (oxides of nitrogen from combustion) will make nitric acid.

 K, P & N are the three main macronutrients present in the soil

 Major source of groundwater replenishment is by rain.

 Slash & burn are not a characteristic of green revolution.

 Breaking down of rocks into small particles by action of water, wind and other elements of weather is called weathering.

Increased mining in coastal areas will result in increased salinity of groundwater.