Igneous rocks form from the cooling and solidification of lava or magma.
I'm not a big fan of this question, but I think the "desired" answer is grain-size (from very large to microcrystalline) and interlocking texture.
(It could be tendentiously argued that tuff (also called tufa) and possibly other pyroclastic rocks, which form from volcanic ejecta, lack an interlocking texture because they are more like sediments that are welded together. I say this is tendentious because such rocks are about as much sedimentary as they are igneous, and are not typical igneous rocks if they are igneous rocks at all.)
In 1928 C."Canberra." became the federal capital of Australia. It may not be the largest city in all of Australia, but in-fact is the largest in-land city.
For volcanoes to emerge oceanic and continental tectonic plate has to collide. Oceanic plate will subduct (sink), and will melt. Molten plate rises through crusts and forms volcanoes.
In Himalayas two sections of continental crust and create mountains (they don't subduct and melt).
Paperboy and less commonly Papergirl.