What best explains why the period from 1200 to 900 B. C. is known as the Dark Age of Greece?

During the Dark Ages of Greece, the significant old settlements were surrendered with the remarkable particular case of Athens, and the population dropped drastically in numbers. Later in the Dark Ages somewhere in the range of 950 and 750 BCE), Greeks relearned how to compose by and by, yet this time as opposed to utilizing the Linear B content used by the Mycenaean's, they embraced the letter set used by the Phoenicians "enhancing in a principal path by presenting vowels as letters.