Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

0.05
15
1
6.5

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Environmental Engineering in CE
Lagoons used for purification of polluted water

All of these
Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre
Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
Use micro-organisms/bacteria in presence of dissolved oxygen

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