The Ozone layer, which mostly lies on the lower portion of the stratosphere.
How Long Did The Vietnam War Last. The Vietnam War is the longest war ever to have taken place in the American history. It lasted for 16 years and it was terrible for the Americans at that time as the Civil Rights campaign was at its peak and so also the Vietnam War and anti war protests.
The Korean War lasted less than three years, but it included four years on the calender. It began in the summer 1950, continued throughout 1951 and 1952, and ended in early 19â¦53. 3 people found this useful.