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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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