I thinks it’s 2...........
I believe the answer is the second one.
Precipitation is your answer. according to my science textbook, in a cold front, warm air and cold air interact and cause precipitation.
The answer is voice onset time. It is a part of the production of stop consonants. Its definition is the length of time that passes between the release of a stop consonant and the start of the voicing and the vibration of the vocal folds.
