Environmental Engineering in CE
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

t = 15 + 0.0065h
t = 15 - 0.0035h
t = 0.0035h -15
t = 15 - 0.0065h

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Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

Oxidation of carbonaceous matter to CO₂
All of these
Coagulation and flocculation of colloids
Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

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