Answer:
the andes
Explanation:
likewise a comparatively young and seismically restless mountain range , runs down the western edge of the continent
The main reason is that the USA is in the Northern Hemisphere & Australia is in the Southern Hemisphere. It has all to do with the tilt of the earth as it revolves around the Sun. Summer happens in the hemisphere tilted towards the Sun, and winter happens in the hemisphere tilted away from the Sun.
