What are the reasons for the rise and fall of the ancient civilizations of Greece?

Ancient Greek civilization has been known since the 3rd millennium BC. NS. and it ended with the “dark ages” of the 11-9th century BC. NS. As we know, civilizations in Crete and Greece coexisted in parallel, hence the name Minoan and Crete-Mycenaean civilizations. The main reasons for the decline of civilizations on the island and on the mainland were different. Minoan civilization (Crete) – fell into decay due to the explosion of a volcano on the island of Santorini. A huge wave destroyed the coastal cities, and in the middle of the 15th century BC. NS. a great fire broke out, over time Crete was conquered by the Achaeans. The Mycenaean civilization and statehood perished under the blows of the Dorian tribes in the 12th century BC. NS.