"Natural lava" refers to molten rock that flows out of a volcano during an eruption. It's called "natural" because it is produced by the Earth's own processes, without any human intervention. Full definition
Every single one of its 52 miles is rife with breathtaking waterfalls, natural lava arches and formations, local crafts, sheer cliff views, and lush Hawaiian flora and fauna. (ordinarytraveler.com)
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