Answer:
secondary :it goes according to the processes from chopping to timber etc
Lake Eyre is the Great Artesian Basin and is located in the Lowest point of Australia.
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As far as largest, its the pacific plate. Smallest has two answers: Juan De Fuca, off the coast of the American Northwest, is the smallest major plate, but of all plates, major and minor, the smallest is the Galapagos microplate.
Mantle Rock would be the most densest at ITS LOWEST POINT.