mostly low plateau with deserts, rangelands and a fertile plain in the southeast; mountain ranges in the east and south-east. ... The geography of the continent is extremely diverse, ranging from the snow-capped mountains of the Australian Alps and Tasmania to large deserts, tropical and temperate forests.
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They are both on a bigger scale and if they shift they can cause an earthquake that’s cause a reaction chain of events
Because of the land and open space. it was a good place for growing crops because of the rich soil
The answer is: "Protective" .
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