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 cannot be assembled from smaller, noncritical pieces of material.
C. A critical mass is the minimum amount of material that will spontaneously undergo a chain reaction.
D. A critical mass will detonate when it is separated into subcritical pieces.
E. none of the above
Answer: A
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A. ZnO B. Zn C. MnO2 D. Mn2O3 E. none of the above
A major factor in human population increase in the last 200 years is the emergence of early and modern agriculture
Indicate whether the statement is true or false
Calculate the vertical exaggeration of your profile in problem. Use a ruler to compare the horizontal (map) scale with the vertical scale of the graph.
(a) Horizontal Scale: 1 inch = ____________ feet
(b) Vertical Scale: 1 inch = ____________ feet
(c) Vertical Exaggeration = ____________ x
Land costs generally decline with distance from the central city
Indicate whether the statement is true or false