The internal energy and temperature of a system decrease (E E. The System and Work. The system is usually defined as the chemical reaction and the boundary is the container in which the reaction is run. In the course of the reaction, heat is either given off or absorbed by the system.
The Middle Ages began in the year 476 A.D. and ended around 1300 with the beginning of the Renaissance. The Middle Ages, also called the Medieval Period, began just after the fall of Rome and it dominated the European continent through the early 14th century. The Middle Ages filled a time period between the ending of a great reign and the beginning of a new era characterized by revitalization and cultural growth.
However, nowadays we have learned a lot more about this period and modern historians prefer to refer to it as the Early Middle Ages instead of the Dark Ages. The next period, from 1000 AD to around 1300 is the High Middle Ages, and the next period, 1300 to 1500 is called the Late Middle Ages.