If you group countries on a continent to their proximity to each other what have you created?

How many states are on the map? How did agriculture lead to the growth of cities? Is Mt Vesuvius located in the northern hemisphere or the southern hemisphere? What tools are commonly used to study daily life? Extensive land masses of land rising above the sea level? What country is located at 40N and 4W? The flooding of the Tigris and Euphrates led to an abundance of fishing eroded land or fertile soil? What is the capital of the norfolk? What are the continents in the Eastern Hemisphere but not in the Northern? How are culture regions related to the eight traits of culture? Which country looks like a lion on the map? Which Indian city was formerly known as Khadki? Which country has the worlds second largest population after China? What is the number of letters in name Mexican state in which Acapulco is located? What country is levi's from? What is the area of Saint-Rirand? Is hilo located on the big island of Hawaii? What oceans does Vietnam border? Which river begins in the Blue Ridge region flows to the Gulf of Mexico and provides a natural boundary between Georgia and Alabama? What is the importance of national territory?

If you group countries on a continent to their proximity to each other what have you created?