Why would a rural resident of a country in Sub-Saharan Africa move to a city slum?
What will be an ideal response?
Answers should include access to economic opportunities, droughts, need for quick cash, cultural problems in rural areas.
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A common pulley is effectively a
A. hydraulic press. B. common lever. C. tension producer. D. gear.
The concept of space-time compression means
A) as an object moves faster through space, time slows for that object. B) people no longer have time to read books. C) today it is harder than ever to keep track of what is happening in distant places. D) distant places in the world are becoming effectively closer together. E) there is more space in smaller places than ever.
Assuming 10-percent trophic efficiency, the other 90 percent of the energy associated with a given trophic level is ________.
A. lost as heat B. transferred to lower trophic levels C. converted to bioluminescence D. transferred to higher trophic levels
Air-mass source regions
A) are most common at mid-latitudes. B) are typically on the order of a thousand square kilometers in size. C) typically require many days to form an air mass. D) exist in winter, but not in summer.