I
live in New Ze
aland.
It's called plate tectonics dude, continental drift. It's something everyone learns at intermediate school - the continents are big plates of rock, and they are slowly grinding around on top of the underlieng sea of magma, they have been doing this for billions of years, moving at really slow (but easily detectable) speeds. The force of the continents moving has the power to push plates together, under, over each other, into each other.. making volcanoes, earthquakes, and mountains such as the himalayas. It's the reason all continents do look like they fitted together at some point - because they did. Pangea? Gondwanaland? That's also something everyone learns at intermediate school.
Riight?
Btw,
this website has a really cool animation of it