The central regions of Earth's core are solid because
a. the composition at the center of the core is lower in iron.
b. the pressure at the center raises the melting point.
c. the magnetic field cannot penetrate into the center of the core.
d. convection does not extend all the way to the center of the core.
e. Earth initially formed from solid particles in the solar nebula.
B
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Coefficient of performance is
A) 1 - Qcold/Qhot. B) Q/m. C) Qout/Win. D) Q - W. E) 1 - Tcold/Thot.
Compared with the sum of isolated-nucleon masses, their collective mass in a composite nucleus is
A) more. B) less. C) the same.
A nearsighted person has a far point of 18 cm. What power contact lenses will allow this person to comfortably see distant objects clearly?
A) +5.6 diopters B) -5.6 diopters C) +0.056 diopters D) -0.056 diopters
Why is it that the most ancient rocks are found on the continents, and not on the ocean floor?
What will be an ideal response?