earth science.

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i searched google and no help. i have been stuck for hours.i have to do a packet and i cant under stand it. it says ' sea level 10 degrees = 1 atmosphere and then i have to do tropopause ,stratapause and mesopause and the rest of it says . an atmosphere is a unit of air pressure . 1 atmosphere =average air pressure at sea leve under normal comditions. 1 atmosphere = 14.7 pounds per square inch or 29.92 inches of mercury.
i don't get this at all if you can please help it will be greatly appreciated

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