Discussion
Which layer extends from the surface to about 11 kilometres in mid-latitudes?
Answer: B
The troposphere contains about 80 per cent of the atmospheric mass and almost all of the water vapour, and its temperature falls with height at an average of about 6.5 kelvin per kilometre. Its depth varies from about 8 kilometres at the poles to about 17 in the tropics. Virtually all weather occurs within it, which follows from its containing the moisture and from its lapse rate permitting convection. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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