Why is Nova Scotia a formal region???

Nova Scotia (/noʊvə ˈskoʊʃə/) is a province in eastern Canada. With a population of 923,598 as of 2016,[3] it is the most populous of Canada's four Atlantic provinces. It is the country's second-most densely populated province and second-smallest province by area, both after neighbouring Prince Edward Island.[3] Its area of 55,284 square kilometres (21,345 sq mi) includes Cape Breton Island and 3,800 other coastal islands. The peninsula that makes up Nova Scotia's mainland is connected to the rest of North America by the Isthmus of Chignecto, on which the province's land border with New Brunswick is located. The province borders the Bay of Fundy to the west and the Atlantic Ocean to the south and east, and is separated from Prince Edward Island and the island of Newfoundland by the Northumberland and Cabot straits, respectively.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.