Blank and blank are closely connected geography, what are the blanks?

The point where two air masses meet is called a

:calculate the sum of the interior angles of a 13-sided polygon.

Ineed quickly! which of the following would not be considered an example of the transition of europe into the formation of larger nation-states? a. the hundred years' war b. the unification of italy c. the marriage of isabella and fernando d. the height of feudalism