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10 questions from this quiz
Milankovitch cycles, sun spots, volcanoes
Approximately 100,000 years
Earth moves closer to Sun & receives more heat
Approximately 23,000 years
Between 21.5° and 24.5°
Warmer global temps & more extreme seasons
Increased solar activity & more energy output
11 years
Short-term cooling lasting several years
Approximately 0.5°C
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