Mountains are melted overheated huge buildings and cities from the last great civilisation of the old world we must realise that this entire realm is nothing but red brick and concrete structures and most of it is melted ruins turned into rock stone and mountains this happened after the liquid melt cooled down instantly rather like lava does and formed what we see here but remember different levels of electrical heat causes altered states of matter where the remains can be different ranging from sand to granite or other stone but in theory stone only appeared after the red bricks and concrete melted into those substances