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The diamonds which form well below the Earth's surface only emerge after powerful volcanic eruptions. |
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Diamonds form deep within the Earth and can only be brought to the surface by powerful volcanic eruptions. |
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Powerful volcanic eruptions are needed to bring to the surface diamonds which have formed deep below the Earth's crust. |
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Violent volcanic eruptions have forced diamonds buried deep within the Earth to surface. |
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Diamonds have been brought to the surface of the Earth by violent volcanic activity, but they are formed deep within the Earth. |