Environmental Science
Condensation nuclei may be:

All of these
Particles of dust
Smoke from forest fires
Salt from the ocean
Nitric acid particles

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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:

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

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