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What natural resources or resources does Australia have that are not found anywhere else in the world?

this is the question i got from school in the exact words: Does Australia have resources that can be found only there, or are resources there of a high quality? Describe the quality and quantity of natural resources.

Public Comments

1. Australia has around 90% of the worlds opals
2. Lots of uranium, lots of opals, big producer of wheat and wool...