Originally Posted by
Tyo Solo
I think the mountains argument is a bit of a misnomer though. As a couple of you have said, there are "walls of mountains" where "landmaIss" continents colide, but equally, The Andes and Sierra Nevada are basically walls of mountians where tectonic plates collide and the landmass crumples (or has crumpled in previous millenia), but this just happens to be along a coast. Case in point, look at the north of Canada, there is currently no reason for the large mountain range that is there to exist, however, these plates have been moving for millions of years, and have had many different formations, allowing mountain ranges and fells to be formed in the strangest places (Lake District, UK, for example).
Additionally, Mars has no plate tectonics, yet it has mountains due to huge volcanic activity in the past, creating individual mountains of up to 310 miles across. (Olympus Mons). Venus again has no plate tectonics, yet look at this huge list of mountains: [URL="http://en.wikipedia.org/wiki/List_of_montes_on_Venus"]http://en.wikipedia.org/wiki/List_of_montes_on_Venus