At 800,000 years the Big Island (Hawaii) is the youngest of the island chain. However, it was the first island discovered by voyaging Polynesians.
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All subterranean minerals belong to the state of Hawaii. Except for state owned water, some lava stone, and minor granites and semi-precious minerals, there are few underground minerals.
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Honolulu is the largest city in the world -- at least it has the longest borders. According to the state constitution any island (or islet) not named as belonging to a county belongs to Honolulu.