a)The Greeks were unskilled sailors,so it was difficult for them to travel across the rough waters of the Mediterranean.
b)Greece is located in mountainous terrain,so the Greeks could trade with other civilizations,but only rarely.
c)Greece is located on the Mediterranean at a crossroads of different civilizations,so ideas and trade flourished.
d)The geography of Greece made the spread of ideas difficult because of the shallow water level of the Aegean Sea.