Environmental Science
The gas that shows the most variation from place to place and from time to time in the lower atmosphere:

Carbon dioxide (CO2)
Methane (CH4)
Water vapour (H2O)
Ozone (O3)
Argon (Ar)

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Environmental Science
Our seasons are caused by:

All of these
The length of the daylight hours
The angle at which sunlight reaches the earth
Only (b) and (c) are correct
The changing distance between the earth and the sun

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Environmental Science
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Higher air temperature in the Gulf States
Higher water temperature in the Gulf of Mexico
Lower air temperature in Southern California
Low relative humidity of the air over the Pacific Ocean

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