Environmental Science
Man made sources of radiation pollution are:

nuclear fuels and preparation of radioactive isotopes
mining
all of these
explosion of nuclear weapons

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

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

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Environmental Science
The climate of a given region is

average temperature and precipitation conditions
average temperature and precipitation conditions for every day of the year in a given region
its weather patterns
its weather

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