By what primary heat transfer mechanism does the sun warm the earth?
A) convection
B) conduction
C) radiation
D) All of the above processes are equally important in combination.
C
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In a folded sequence of rocks we find younger rocks at the axis of the fold and older rocks away from the fold axis. The fold is
A) called a syncline. B) called an anticline. C) plunging. D) tilted.
Four 12
resistors are connected together. What is the least resistance that can be attained with these resistors?
A. 12 
B. 6.0
C. 3.0
D. 2.0
E. 1.0
Power: A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in 3.1 min, what is the average power delivered by the child?
A. 17 W B. 21 W C. 22 W D. 26 W
In partially stabilized zirconia, particles of the tetragonal phase transform to the _________phase at the crack tip when subject to a sufficient stress.
Fill in the blank(s) with the appropriate word(s).