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It depends on the type of lava. The lava most people think of when they hear the word is basaltic lava. This lava cools into a black rock that may either have a ropey or jagged surface. It will often have bubbles near the surface of a flow. Over time, this rock may turn red as iron in it is oxidized.

Other types of lava may form gray, white, or brownish rocks.

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11y ago

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