Answer: . invasions by sea and land
Explanation:
The civilization in Mycenaean Greece is proposed to have been halted by various theories.
Among is the Dorian invasion which is term invasion by land as well as sea peoples invasion.
It is proposed that the Dorian invaded peloponnesus and took possession of some cities and also invading with their culture in an event named the RETURN OF HERACLEIDAE, although the existence of Dorian invasion us been disputed.
The invasion by the sea peoples is also been connected to the end of this civilization.
Additional theories includes natural disasters and climate change.
