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Global warming quiz

1. What is the most common greenhouse gas emitted from human activities?
less than 0.1%25, 0.1%25 to 1%25 crossword maker , 1%25 to 2%25, more than 2%25,
2. What is the Earth%27s average temperature?
about 5 °C, about -3 °C, about 15 °C online learning games , about 23 °C,
3. The greenhouse effect is the same thing as global warming.
True, False, ,
4. Carbon dioxide forms # of the Earth%27s atmosphere.
nitrogen, oxygen online quizzes , carbon dioxide, methane,