The influence that the geography of Greece has to Greek's interaction with each other was: It caused independent city-states to develop
Due to the geographical factors such as mountains that separate area within Greeks from one another, it is very hard for the central government to rule/regulate all corners of Greeks. This is why they create an independent city states to ensure that all territories that cannot be easily reach by the central government able to regulate/control themselves.
Railroad, barbed wire and the modern water pump
La Niña, this is because it blows warm air into places like Australia and Indonesia causing wetter conditions than normal, while making places like the southwestern US much drier.
Ice ages and interglacial periods don’t happen frequently and there are rainy seasons in Australia every year.
And El Niño affects South America as it moves warm air East towards the Americas, not affecting the areas specified in the question.
I hope this helps!
