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

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

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Environmental Science
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

The sun's energy is less intense in the Southern Hemisphere
The earth is closer to the sun in January
The earth is farther from the sun in July
Over 80% of the Southern Hemisphere is covered with water

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