The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the average speeds of gas particles as a function of temperature for various gases. Which of the planets or satellite plotted in this diagram is least able to hold an atmosphere?
A) Mars
B) the moon
C) Mercury
D) Venus
E) Earth

Question

The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the average speeds of gas particles as a function of temperature for various gases. Which of the planets or satellite plotted in this diagram is least able to hold an atmosphere? 
A) Mars 
B) the moon 
C) Mercury 
D) Venus 
E) Earth

Quizplus · Accepted Answer

The moon has the lowest escape velocity and does not have enough gravitational force to retain an atmosphere.

The Graph Below Plots the Escape Velocity of Each Planet