Which of the following could be the reason that Mars has only a thin atmosphere?
A. The atmosphere is spread over a very large area.
B. The gravitational pull from Earth caused Mars to lose some of its atmosphere.
C. The gravity on Mars was insufficient to hold a thick atmosphere and hence the gases in the atmosphere escaped over time.
D. All of the above.
E. None of the above
Answer: C. The gravity on Mars was insufficient to hold a thick atmosphere and hence the gases in the atmosphere escaped over time.
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a. blue light has a higher energy than red light. b. blue light has a lower energy than red light. c. blue light has a shorter wavelength than red light. d. blue light has a longer wavelength than red light. e. More than one of the above.
A comet near the Sun whose orbit is ____ would never be near the Sun again
a. apogee b. circular c. elliptical d. hyperbolic e. radial
The magnetic field of Mars was first detected by the Mars Global Surveyor
Indicate whether the statement is true or false
What is the proper abbreviation for ‘seconds?'
a. sec b. There is none. It should always be spelled out. c. secs d. s e. none of the above