Diplomatic ties between Cuba and the United States were restored in 2015 . What factors led to the thaw between the two countries, particularly in relation to economic concerns?
• The failing health of Fidel Castro
• the discovery of significant oil reserves off Cuba's shores
• fear was that US businesses would lose important opportunities if the door remained closed
• economic pressures were imperiling the Cuban regime: Russia did not carry on the Soviet legacy of subsidizing Cuba as its strategic partner in the Western Hemisphere, and plummeting oil revenues made it impossible for Cuba's neighbor Venezuela to keep propping up Cuba.
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The diagram below reminds us that
A) ecosystem structures tend to occur on land and ecosystem functions tend to occur on water.
B) ecosystem functions are dynamic processes that support the ecosystem.
C) ecosystem structures and functions are largely the same in most ecosystems.
D) ecosystem functions occur on long time periods.
When it is said that waves are out of phase means that they are
A. of different wavelengths. B. of different frequencies. C. out of step. D. of different amplitudes.
Longitude and latitude are measured using the unit terms of
A) degrees, minutes. B) degrees, minutes, seconds. C) degrees, hours, minutes, seconds. D) miles, feet, inches.
Describe and discuss the difference between a craton and a shield. What will be an ideal response?