Currents in Earth's molten iron core create the planet's magnetic field. These currents are probably caused by
A. radioactivity and convection.
B. rotational motion and radioactivity.
C. rotational motion and convection.
D. rifting and subduction.
Answer: C
Physics & Space Science
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Fill in the blank(s) with the appropriate word(s).
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Which of the following atoms normally has one covalent bond to it?
a. I b. O c. C d. P e. Kr
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____ is a segment of a chromosome that controls a specific function
a. DNA b. RNA c. An enzyme d. A gene e. An amino acid
Physics & Space Science
A torque of 20.0 N•m is applied to a bolt. The bolt rotates through an angle of 180 degrees. The work done in turning the bolt is
A. 72.5 J. B. 51.9 J. C. 62.8 J. D. 49.9 J. E. 58.4 J.
Physics & Space Science