It helps them know when something happened and if one event lead to the cause of another <span />
Answer:
1. Communist countries of Eastern Europe that were
dependent on the Soviet Union
The type of wave which needs a medium to travel are sound waves because they travel by oscillating electromagnetic fields
<h3>What is a Sound Wave?</h3>
This refers to the waves of refraction which is propagated by a plastic medium.
With this in mind, we can see that mechanical waves are the types of wave that needs a medium for propagation and a sound wave is an example of a mechanical wave because it travels by oscillating electromagnetic fields.
Read more about mechanical waves here:
brainly.com/question/9242091
The ensuing debt and financial crisis contributed to the unpopularity of the Ancien Régime. This led to the convening of the Estates-General of 1789. Discontent among the members of France's middle and lower classes resulted in strengthened opposition to the French aristocracy and to the absolute monarchy, of which Louis and his wife, Queen Marie Antoinette, were viewed as representatives. Increasing tensions and violence marked by events such as the storming of the Bastille during which riots in Paris forced Louis to definitively recognize the legislative authority of the National Assembly.
