Natural water is often polluted. It is advised to equip drinking water tap with ............. in order to treat water coming into house.

The role of water filters is to:

How do filters work? Filters have pores where

Dust and solid particles are very hamful to car engines. Air filters

In order to protect car engines from solid pollutants coming in with fuel, cars are equiped with:

Pollution occurs when harmful materials are released into environment. Air pollution occurs

Indicate which of the following is not a source of air pollution.

Water pollution can be reduced by:

Vehicles are major sources of air pollution. Suggest way to reduce air pollution caused by vehicles.

Indicate which of the following is not an effect of water pollution.

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