Turbidity. As your book/question states it is a measurement of cloudiness in water.
The answer would be yes. Modern democracy has the Athenians and Pericles to thank for bringing the ideas to fruition.
There missiles ready and pointed at each country by the enemy state.
The movement of USSR missiles to Cuba caused an immediate reaction by the US. Negotiations worked back and forth to prevent a missile attack by either side. The US had missiles in Turkey which the USSR believed to be a threat to their safety.
The correct answer is by negotiating a peace deal
The Tet Offensive comprised of a number of surprise attacks on all major installations in South Vietnam which were carried out by the Viet Cong and North Vietnamese military. The event proved that the U.S was not winning the war and changed public opinion about the war leading the U.S to the negotiation table