Which of the following statements about climate change is true?
A) The Earth's mean global temperature has fluctuated throughout geologic time.
B) The Earth's mean global temperature has increased steadily throughout geologic time.
C) The Earth's mean global temperature has decreased steadily throughout geologic time.
D) The Earth's mean global temperature has been relatively constant throughout geologic time.
Correct Answer:
Verified
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
Q25: About 55 million years ago, climate warmed.
Q27: Water molecules containing 16O are _ and
Q28: The most useful of the methods listed
Q29: The four industrial greenhouse gases are:
A) carbon
Q30: Since the Earth formed, solar energy output:
A)
Q31: Greenhouse gases:
A) block infrared radiation and prevent
Q39: Which of the following is a greenhouse
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