The average temperature over the past 1000 years has been about 15?C?C. From the graphs, you can conclude that Earth's average temperature during the past 800,000 years has
A. varied between about 7?C and 19?C
B. stayed remarkable steady, never varying by more than about 2?C
C. never been as high as it is today
D. varied between about ??10?C and +4?C
Answer: A. varied between about 7?C and 19?C
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