Underlying all machines is
A. energy conservation.
B. that power input always equals power output.
C. that energy input always equals energy output.
D. all of the above
Answer: A
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What is the main factor scientists believe will be responsible for the extinction of a large number of species in the next 100 years?
A. Elimination of habitats by humans B. Pollution of river and oceans C. Unusual solar bursts D. Increased volcanic activity
Which of the following sources of iron would be of the highest quality?
a. iron deposits on the ocean floor b. a field of spinach c. a large scrap metal junkyard d. a half-mile deep deposit of iron ore e. soil that is high in iron content
Determine the percentage of each particle size for A and B examples plotted on the triangle (Figure 28.2):
a) A: ________% sand, ________ silt, ________ clay
b) B: ________% sand, ________ silt, ________ clay
Based on the volcanic type and construction of the flanks, what assumptions can you make about the viscosity of the lava?
A) The lava is high viscosity. B) The lava is low viscosity.