A snowball that rolls down a hill, gradually gaining more and more mass and rolling faster and faster as it continues, would be an example of a(n)
A. positive feedback system.
B. closed system.
C. negative feedback system.
D. open system.
Answer: A
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The newly-formed Earth’s atmosphere was very different from Earth’s current atmosphere because it had ____
a. an abundance of mercury vapor b. an enormous amount of carbon dioxide, resulting in very hot temperatures due to greenhouse effect c. virtually no oxygen, a necessary component for the existence of animal life d. an enormous amount of methane and ammonia, which was never lost by the atmospheres of the outer planets e. virtually no nitrogen, the major component of today’s atmosphere
Which of the following factors does not usually affect the crude death rates of a population?
A. Health care B. Age structure of the population C. Nutrition D. Sanitation E. All of these affect crude death rates
Concentric fracturing of rock, resulting from the removal of overburden pressure
a. Chemical Weathering b. Expansion from Unloading c. Spheroidal Weathering d. Mechanical Weathering e. none of the above
Which of the following produces the strongest Coriolis force?
a. fast winds; low latitude b. fast winds; high latitude c. slow winds; low latitude d. slow winds; high latitude e. fast winds; intermediate altitude