Environmental Science
The earth's first atmosphere was composed primarily of:

Oxygen and water vapor
Carbon dioxide and water vapor
Argon and nitrogen
Hydrogen and helium

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

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

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