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Geography4Kids Quiz: Earth Structure OverviewQUESTION 3: CORRECT! The thickness of the atmosphere is very thin when you compare it to the thickness of the Earth. The radius of the Earth is about 6,300 kilometers at the equator. The atmosphere is only about 11 kilometers high. It's tough to get an exact measurement of the atmosphere because it becomes very thin as you go higher. > Continue to Next Question > Restart Quiz
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