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Mathematics 10 Online
OpenStudy (anonymous):

Estimate the percentage of the mass of the atmosphere that resides in the stratosphere based on the following information: The mean pressure level of trapical tropopause is around 100hPa and that of the extratropical tropopause is near 300 hPa. The break between the tropical and the extratropical tropopause occurs near 30 degrees latitude so that exactly half the area of the Earth lies in the tropics and half in the extratropics.

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