Which is a parcel of air,with less than 100% relative humidity,that is rising because of heat energy derived from the surface?

Question

Quizplus · Accepted Answer

An air parcel with less than 100% relative humidity that is rising due to heat energy from the surface is called an unstable parcel. This is because as the parcel rises, it cools and if it remains unstable, it will continue to rise and potentially develop into a thunderstorm or other convective activity. A stable parcel would not rise and would remain in place or sink. A conditionally unstable parcel is one that is initially stable but can become unstable if it reaches a certain level in the atmosphere where the temperature and moisture conditions are just right for it to rise. However, this does not match the conditions described in the question, so it is not the best answer.

Which Is a Parcel of Air,with Less Than 100% Relative