close the walls and ceiling raufarholshellir lava tunnel near reykjavik iceland |
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| navigate by keyword : rock geology formation boulder terrain bedrock stonewall wall nature raufarh lshellir lava tunnel close walls reykjavik iceland raufarholshellir ceiling formed cooled roof created hot drains drained leaving stopped away lavarock |
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| The lava tunnel at Raufarholshellir was created when the hot lava above cooled, formed a roof and the hot lava stopped and drained away leaving a tunnel. |
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