What is the escape speed from a planet of mass M and radius R if M = 3.2 × 10^23 kg and R = 2.4 × 10^6 m?
a. 5.5 km/s
b. 4.2 km/s
c. 5.2 km/s
d. 4.8 km/s
e. 3.7 km/s
B
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In order to have a global magnetic field, a planet must have
A) an electrically conducting fluid in its interior which is undergoing convection and a reasonably rapid rotation B) magnetic rocks in its interior C) magnetic rocks on its surface D) a large core of solid magnetized iron
In general terms, how do the temperature structures of the atmospheres of Venus and Mars differ from that of Earth?
A) They lack ultraviolet-absorbing stratospheres. B) They lack X-ray absorbing thermospheres. C) Their atmospheres are similar in structure to Earth's but with much higher temperatures. D) Temperatures in their tropospheres increase with altitude, rather than decreasing with altitude.
Of the three agents of erosion—water, wind and ice—the one with the ability to move only the smallest particles is
A) ice. B) water. C) turbulent water. D) wind.
The plastic-like substratum on which the lithospheric plates move is called the
a. outer core. b. endosphere. c. isosphere. d. asthenosphere.