Environmental Science
The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called

air pollution
soil pollution
water pollution
radioactive pollution

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Time of minimum temperature and the time of maximum solar radiation
Time of maximum solar radiation and the time of maximum temperature
Sunrise and sunset
Minimum and maximum solar energy received at the surface for a given day
Minimum and maximum temperature for a day

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