As a "parcel" of air in the atmosphere attempts to rise, the surrounding air pressure decreases, causing the "parcel" to expand and cool.
(a "parcel" of air in the atmosphere; attempts; to rise) (a "parcel" of air in the atmosphere; to rise; ) (the surrounding air pressure; decreases; T:As a "parcel" of air in the atmosphere attempts to rise)
a "parcel" of air in the atmosphere a "parcel" of air in the atmosphere the surrounding air pressure
attempts to rise decreases
to rise
T:As a "parcel" of air in the atmosphere attempts to rise