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Craters
of the Moon
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Calvin Coolidge decided that Craters of the Moon would be a monument. It became a monument in 1924. Craters of the Moon is in Arco, Idaho. |
| It is part of the Snake River Plains. In some places of Craters of the Moon the lava is 10,000 feet deep. It is a lava flow bed. |  |
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Craters of the Moon is 54,400 acres. It contains 55 cones with lava flows and 14 fissures. Eruptions took place in 2,000-53,400 acres long. |