The chain of processes in a system that operate in a repeating or changing cycle is called:
a. positive feedback
b. negative feedback
c. a steady state
d. a feedback loop
d
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Which of the following statements is true regarding HIV/AIDS in Africa?
A. The incidence of infection is higher in rural areas than in urban places. B. It is spread primarily by military personnel, migrant workers, and prostitutes. C. AIDS spreads quickly across the continent because mosquitoes carry it. D. Only Southeast Asia has more cases of HIV than Africa south of the Sahara.
The alternating stripes of magnetic field patterns are used to explain ____.?
a. ?seafloor spreading b. ?island chains c. ?transform faults d. ?stratovolcanoes e. ?oceanic trenches
________ is the ability of a soil to resist deformation
Fill in the blank(s) with correct word
As you experience a warm, dry, cloudless summer day or a cold, wet, overcast winter day, you are encountering the
a. weather. b. climate. c. biosphere. d. effects of global warming. e. regions of the world.