I am unsure of how to answer this completely, but I will give it my best.
It could be meant that there is no physical boundary holding them apart and that the world's oceans simply flow into each other rather than being separated. Such as the pacific and Atlantic. They are not held apart, they flow around countries and flow into each other at a certain point.
Most of China’s ancient civilizations are hard to find mainly because of the harsh land scapes around mountains. And other areas.
Answer:
A political map of the United States.
Explanation:
Hope this helps! :)
Answer:
Population distribution in Russia and Europe is most impacted by cultural differences.
Explanation:
