Which of the following statements best describes a critical mass?
A) A critical mass is the minimum amount of material that will undergo nuclear detonation.
B) A critical mass is the minimum amount of material that will spontaneously undergo a chain reaction.
C) A critical mass cannot be assembled from smaller, noncritical pieces of material.
D) A critical mass will detonate when it is separated into subcritical pieces.
E) none of the above
A
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Which of the following reasons explain why mafic lavas tend to erupt mildly?
a. Because it contains less silica bonds (so lower viscosity) b. Because gases easily escapes c. Because it contains high silica bonds d. Both b and c e. Both a and b
The openings on the surfaces of plant leaves through which gases move into and out of are known as
A) guard cells. B) stomata. C) chlorophyll. D) chloroplasts.
The mT air masses pictured here originate
A. over water, are unstable, and bring warm air during the winter. B. over water, are stable, and bring cold air during the summer. C. over land, are stable, and bring cold air during the summer. D. over land, are unstable, and bring warm air during the winter.
The main cause of undernourishment and malnourishment in the world is
A) lack of education. B) poverty. C) underproduction of food. D) problems with global distribution of food.