Most of us fly in the troposphere, that layer of the atmosphere closest to the earth, the one with the weather and pizza-delivery drones. It's characterized by -- among other things -- decreasing temperature with height. The standard lapse rate (pressure and temperature) in the lower atmosphere is what?


1-inch Hg. and 2-degrees C (3.5-degrees F) per 1000 feet


0.1-inch Hg. and 3.5-degrees C (2-degrees F) per 1000 feet


1.1-inch Hg. and 2-degrees F (3.5-degrees C) per 1000 feet


1-inch He. and 2-degrees C (3.5-degrees F) per 10,000 feet

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