Define crude birthrate (CBR) and crude death rate (CDR). Describe how these rates are used to calculate the percent rate of growth and the doubling time of a population
What will be an ideal response?
"The crude birthrate (CBR) and crude death rate (CDR) are the number of births and deaths, respectively, per thousand of the population per year." To obtain the percent rate of growth one subtracts the number of deaths from the number of births and then divides by ten to give the percent increase or decrease in population per year. To obtain the doubling time the percent rate of growth is divided by seventy.
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a. True b. False
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Indicate whether the statement is true or false
If an earthquake occurred near the oceanic trench in this figure, which one of the following hazards is likely to threaten the town of Ashton?
A. landslides and other slope failures caused by shaking B. liquefaction of soils and other weak materials because of shaking C. destruction by a tsunami D. All of these choices are correct.
Why is it difficult to know if we are out of the Pleistocene or merely in an interglacial period?
What will be an ideal response?