Which of the following moons is most volcanically active?
A. Ganymede
B. Io
C. Callisto
D. Titan
E. Europa
Ans: B. Io
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Explain how we can estimate the geological age of a planetary surface from its number of impact craters.
Fill in the blank(s) with the appropriate word(s).
A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 60°C, what will be the rate of heat transfer?
a. 4 J/s c. 9 J/s b. 8 J/s d. 12 J/s
If y = 0.02 sin (30x - 400t) (SI units), the wave number is
a. 30 rad/m b. 30/2p rad/m c. 400/2p rad/m d. 400 rad/m e. 60p rad/m
Features of the deep ocean basins include abyssal plains, ocean trenches, mid-ocean ridges, and seamounts—all of which are composed of
A) plutonic rock. B) granite. C) basalt.