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How much does the atmosphere weigh over each square kilometer (km2)? Recall that 106 m2 = 1 km2.
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Brileanne
In the last question you calculated that the atmosphere weighs 10 tons over each square meter. Answering this question requires that you first calculate how many square meters there are in a square kilometer. There are 1000 m in 1 km.

Squaring both sides gives: (1000)2 m2 = 1 km2. Thus:

10 tons/m2 x 106 m2/km2 = 10 x 106 tons/km2 = 10 million tons/km2
Biology!
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