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“This is another really great piece of evidence that we had some subaerial land on the early Earth.”

"Early models of the collapse were based on satellite imagery that only looked at the subaerial parts of the volcano," the British Geological Survey scientist told BBC News.

There are other clues telling us this was a subaerial lava flow: can you pick them out?

That mix of sand, gravel, and larger pieces becomes the foundation upon which the continuing lava flow builds a subaerial delta.

This little island may build up and join the rest of the subaerial flow, or it might be eroded away if the flow wanes.