The reason why the world's oldest rocks
are found in Australia is that Australia is geologically a very stable
Mountains are normally built on continental plate
boundaries, either when two plates collide (e.g. Himalayas), or when
volcanoes erupt (e.g. Iceland and New Zealand).
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is away from plate boundaries, so there has been no new mountain
building in Australia for a long time. (The last one in eastern
Australia was the uplift of the Great Dividing Range for 80 million
years ago while in the rest of Australia it has been even longer).
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This stability has given erosion a lot of time to work on Australian
landscape, which is consequently very flat compared to all other
continents in the world.
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