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 Vietnam War was a conflict between communist North Vietnam and the government of South Vietnam. The war spanned more than 15 years, and American involvement in the war was a point of great controversy. This book offers a well-balanced look at the causes of the war and surrounding controversies. Primary sources along with varying historians' opinions allow for a lively analysis. HistoryJuvenile Nonfiction.