List four ways that scientists have used to estimate historic atmosphere temperature changes
What will be an ideal response?
Tree rings, fossils, marine sediments, and ice cores.
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The hierarchical (also known as cascade) diffusion pattern by which HIV/AIDS spread across the world is characterized by moving across the world's
A) lowest income countries. B) major urban areas. C) most popular tourist areas. D) island countries. E) tropical regions.
Which of the following patterns of air movement is associated with the location of Toronto, Ontario (latitude 43°N)?
A. northeast trades B. doldrums C. westerlies D. southeast trades
What river has the largest watershed in North America?
A. Ohio River B. Mississippi River C. Colorado River D. Missouri River
Early in the twentieth century, what was the prevailing view of how land animals migrated across vast expanses of open ocean?
What will be an ideal response?