Answer: Isolation & Defense
Explanation: Mountains significantly impacted the development of Greek settlements, considering the majority of Greece's geography is a mountainous terrain. Two of the most notable effects of mountains on Greek settlements include:
Greece's mountainous terrain led to the isolation of communities, contributing to a development of independence as opposed to a singular and unified nation. This is a very distinctive characteristic of ancient Greek civilizations.
Mountains also impacted Greek settlements in that they provided natural fortifications for the settlements. This protection came with a more strategic advantage defensively, which was crucial in times when wars (primarily between city-states or poleis) were constant.
Overall, Greece's mountainous landscapes played a significant role in shaping the Greek settlements. They helped develop political structures, uniqueness, and social dynamics.