Volcanoes looks like a mountain with a mashive hole in the top for when it erupts. X

There are a different types things that come out of a volcano. Magma turns into lava when it reaches the top of the surface. Otherwise it's lava, ash, gases, steam and bits of rock.

Yes because the twins don't have to come out at the same time. Its if they are ready to come  or not. One might be taking all the things they need inside you and the other one will have nothing so it wont be formed the way it should xxx