What do they need to do to determine what time period eocene belongs to on the geologic time scale

They need to scan a chart on the internet and you know when you find it.

There are certain steps taken by the professionals in order to know more about a certain civilization inside the history of man kind, as there archaeologist and other research workers who digs deep inside the ground and explores the different artifacts which are possibly there to be analyzed by the professionals and then the prepare the different documentations to keep a record of each civilization that existed in a certain period of the planets history.

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.