In fact, a superadiabatic gradient causes convection.
2.
Consider a star with a superadiabatic gradient.
3.
It is characterized by a superadiabatic lapse rate, moisture decrease with height and strong wind shear.
4.
If the environmental lapse rate is larger than the dry adiabatic lapse rate, it has a superadiabatic lapse rate, the air is absolutely unstable a parcel of air will gain buoyancy as it rises both below and above the lifting condensation level or convective condensation level.