The environment is said to be unstable when the:

1
ELR (Environmental lapse rate) is more than the ALR (Adiabatic lapse rate)
2
ELR (Environmental lapse rate) is same as the ALR (Adiabatic lapse rate) 
3
ELR (Environmental lapse rate) is less than the ALR (Adiabatic lapse rate)
4
ELR (Environmental lapse rate) is zero

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