A series of rocks of the Canadian Shield of early Proterozoic age, rich in iron ore; the period of time during which these were deposited. Usually…
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| 单词 | θ5407 |
| 释义 | the world > the earth > structure of the earth > age or period > [adjective] > pre-Cambrian > proterozoic > specific rocks (1) Animikie1873 A series of rocks of the Canadian Shield of early Proterozoic age, rich in iron ore; the period of time during which these were deposited. Usually… |
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