Why are there small islands far away from continents?

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Per my understanding, the ocean is largely very deep.

I can understand why there might be small, not-mountainous islands near the coasts of major landmasses, as it would only take a marginal elevation anomaly to create one there, but: How do places like Polynesia exist?

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Anonymous 0 Comments

Mountains don’t necessarily have to be above ground.
They can be underwater as well.
Actually the longest mountain range in the world, is the Mid-Oceanic Ridge, which is underwater.

If you can get directly to their summits, by boat, you’ll have found an island.
Hawaii for example is the top of a mountain range/mountain.

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