Carbon exists in the atmosphere mostly as methane and __________ __________.
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Q14: There is evidence that extreme cold periods
Q15: Climate change does not follow linear relationships;
Q17: The Little Ice Age lasted from about
Q18: _ record a tree's growth depending on
Q20: The Sun produces energy by _ _.
Q21: Rapid plate movement and sea-floor spreading cause
Q22: Carbon exists in the atmosphere mostly as
Q24: During photosynthesis:
A) carbon dioxide, which is a
Q39: Which of the following is a greenhouse
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