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| Craters of the Moon National Monument, a massive lava flow in southern Idaho that started 16 million yeas ago, with the latest flow as recent as 2000 years ago. | |
| Total images: 123 | Help | |
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| Craters of the Moon National Monument, a massive lava flow in southern Idaho that started 16 million yeas ago, with the latest flow as recent as 2000 years ago. | |
| Total images: 123 | Help | |