When the environmental lapse rate is between the dry and moist adiabatic lapse rates conditions are described as option(b)i.e, conditionally unstable.
The process lapse rate, which relates to a specific air parcel, should be carefully separated from the environmental lapse rate, which is determined by the vertical temperature distribution at a specific time and location. See superadiabatic lapse rate and autoconvective lapse rate.
If the environmental lapse rate is higher than the dry adiabatic lapse rate, the atmosphere is considered to be utterly unstable. The pace at which the temperature in the atmosphere around a cloud or ascending parcel of air changes with height. Although there is an approximate 6.5 °C/km global average rate of cooling, there are significant regional, airstream, and seasonal variations in the pace.
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The complete question is:
When the environmental lapse rate is between the dry and moist adiabatic lapse rates conditions are described as _______________.
a. stability.
b. conditionally unstable.
c. adiabatic.
d. unstable.
