About ________ people migrated from Europe to the United States between 1821 and 1920
A) 55 million
B) 33 million
C) 18 million
D) 21 million
E) 15 million
Answer: B
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Over oceans, rates of evaporation exceed those of precipitation. In spite of this, sea level does not drop. Explain why this is the case
What will be an ideal response?
The two ways in which humans have most interfered with the carbon cycle are
A. clearing trees and plants and aerobic respiration. B. aerobic respiration and burning of fossil fuels. C. respiration and photosynthesis. D. burning of fossil fuels and clearing trees and plants. E. respiration and clearing trees and plants.
When a large amount of dense water sinks at polar ocean basins, the same quantity rises elsewhere in
the world ocean. Indicate whether the statement is true or false.
What changes the compensation depth?
A) Salinity B) Temperature C) Density D) None of these choices