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The tracks of the astronauts who landed on the moon are still there in the dust and show no signs of being worn away. This is attributed to the lack of atmosphere on the moon. Which of the following best accounts for the lack of atmosphere?

1)the moon's weak gravity
2)the moon's changing weather patterns
3)the distance between the earth and the moon
4)the rotation of the moon about its axis
5)the motion of the moon around the sun


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