It is the isthmus of Suez which is very narrow.
I believe the answer you are looking for is the "Neolithic Period".
Answer: B. Buoyancy
Explanation: The asthenosphere exerts a buoyant force that pushes up against the lithosphere, and this force resists gravity. The theory of isostasy refers to an equilibrium in buoyancy between the lithosphere and the asthenosphere.
Western European nations maintained democratic political systems.
