Figure 14.11 plots the return period of impact events and shows ___________. 
A) the smaller the meteoroids,the greater their frequency of impact
B) the larger the meteoroids,the greater their frequency of impact
C) there is no relationship between size and impact frequency
Correct Answer:
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Q2: Extreme variations in the Earth's magnetic field
Q3: In 1994,the comet Shoemaker-Levy crashed with spectacular
Q4: Comets are composed of _.
A) ice and
Q5: The origin of the geomagnetic disturbances affecting
Q6: Which of the following statements regarding asteroids
Q8: A comet's tail _.
A) lines up with
Q9: Why are there so many more impact
Q10: Halley's comet contains carbon,hydrogen,oxygen and nitrogen in
Q11: Comets are found mostly in _.
A) the
Q12: Asteroids lie mostly _.
A) between Mars and
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