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| Cooled from a molten state. Example: granite, rhyolite, gabbro, basalt | |
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| Fragments of igneous rocks or of living organisms: eroded by work of wind, water and temperature changes | |
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| From igneous and sedimentary rocks: after being subjected to high temperature and pressure. Example: marble |
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| The original material of the Solar System: was never subjected to high temperatures and pressure, found in the interplanetary space as a relic |
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