Cuales son los componentes del espacio geografico

The point where two air masses meet is called a

I’m his published 95 theses,martin luther protested against? a-the selling of indulgences within the catholic church b-the belief in predestination c-the worshipping of statues of saints d- the catholic church focus on faith as the sole means of salvation

What is the border between layers a through f and layer g called?