The earth is able to retain its atmosphere because of _____
A. the mean velocities of atmospheric gas molecules which is less than that of the earth’s escape velocity
B. the mean velocities of atmospheric gas molecules which is greater than that of the earth’s escape velocity
C. the gravitational effect of the moon
D. the earth’s magnetic field
Answer:A
The earth is able to retain its atmosphere because of _____
A. the mean velocities of atmospheric gas molecules which is less than that of the earth’s escape velocity B. the mean velocities of atmospheric gas molecules which is greater than that of the earth’s escape velocity C. the gravitational effect of the moon D. the earth’s magnetic field