Which country has the highest ratio of tourists to permanent residents

Andorra

Explanation:

There's lot of nations in the world that first come to mind when tourism is in question, such the UK, France, Italy, Spain, Japan, Brazil, but they are actually far behind the nations that are ranked top as having the most tourists to permanent residents, or rather tourists per capita. It probably comes as a surprise, but the nation that has the most tourists per capita is the micro nation in the Iberian Mountains, Andorra. This little nation is located high in the Iberian Mountains, squeezed in between its two much larger neighbors, Spain and France. Even though it is not the most famous, or the most touristy destination on people's minds, this nation actually has 32.4 tourists per one permanent resident. To put it in perspective, that would be like if France was visited by some 2 billion tourists annually.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.