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The following questions refer to the description and figure below.
The figure represents a cross section of the sea floor through a mid-ocean rift valley, with alternating patches of black and white indicating sea floor with reversed magnetic polarities. At the arrow labeled "I" (the rift valley) , the igneous rock of the sea floor is so young that it can be accurately dated using carbon-14 dating. At the arrow labeled "III," however, the igneous rock is about 1 million years old, and potassium-40 dating is typically used to date such rocks. Note: The horizontal arrows indicate the direction of sea-floor spreading, away from the rift valley.
Figure 25.1
-Assuming that the rate of sea-floor spreading was constant during the 1-million-year period depicted above, Earth's magnetic field has undergone reversal at an average rate of once every
Modern-day Country
A sovereign state with its own government, territories, and population that exists in the present time, recognized as part of the international community.
African Slaves
were individuals from Africa who were forcefully transported and sold into slavery, primarily in the Americas, from the 16th to the 19th centuries.
Smallpox Epidemic
Widespread outbreaks of smallpox, a highly contagious and deadly disease, that have occurred throughout history.
Sugar Cultivation
The agricultural process of growing sugar cane or sugar beets to produce sugar, a practice that has historically been associated with slavery and forced labor in many regions.
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