Because of erosion and glaciers.
south Australia
Parts of Australia's deserts are flat and others are hilly.
The dry flat interior of Australia is known as the Outback. It is characterized by arid landscapes, low vegetation, and sparse population. The Outback covers a vast area of central Australia and is home to unique wildlife such as kangaroos and emus.
Kangaroo Flat is an outer suburb of the rural city of Bendigo in central Victoria.
The world was never flat. It has always been round. Australia has always been in the same place, i.e. the southern hemisphere.
The word "flat" in Australia has a number of different meanings besides simply meaning having a horizontal surface. A "flat" is a small apartment or unit. A "flat" is the colloquial term for when one's tyre is deflated. A "flat" is also an area of flat land around a river, e.g. the "Murray River flats". It can mean "absolutely" as in "flat broke" (no money) or "flat out" (going very fast). To be "flat out" also means to be extremely busy.
Outback may be?
Australia is mostly flat. New Zealand is mostly hilly. (Source: I'm a New Zealander)
The Nullarbor Plain is in Australia. It is a large, flat, treeless desert in the south of the continent, which parallels the Great Australia Bight.
the people were mad and did not enjoy the experence. it flat out sucked
If you're trying to send one to australia. "Flat rate shipping boxes" mail all over the World. If it fits it ships.