Question 1: The area of the Earth's surface is approximately 516 X 106 km2. What is the weight of the entire atmosphere in tonnes? Express your answer using scientific notation, in units of 1012 tonnes.
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Question 2: It is worth pointing out that this is by no means an incomprehensibly large number. The mass of the Earth is 6 X 1027 g. How does the atmosphere's mass compare to that of the Earth?
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