If total fertility rates are decreasing, why is the world's human population still increasing?
What will be an ideal response?
In spite of decreases, the total fertility rate in most less-developed countries is still above replacement fertility rates, therefore the world's population has not stabilized.
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What is being proposed by NGOs as an alternative biofuel to reduce deforestation in Africa?
A) dung B) Eucalyptus C) Bamboo D) Tropical Hardwoods E) Savanna Woodlands
Which volcano is shown in Figure 20.3b? Explain your conclusion. Which tectonic setting is the source of its magma? What are the types of materials produced during eruptions and the hazards associated with these volcanoes?
Which of the following would be least readily recycled?
A. copper pipes B. lead from car batteries C. aluminum beverage cans D. chromium from stainless steel fixtures
Where do most asteroids originate?
A. from the Kuiper belt B. between Mars and Jupiter C. between the moon and Mars