cemented, glued together or strengthened, compacted, pressed firmly together, decay, to rot or break down, prehistoric, a time before written records, soil, upper layer of the ground, transform, change the form of something, fossil, remains of life that have hardened in rock, igneous, when molten rock has solidified, magma, hot, fluid material beneath the Earth's crust, metamorphic, being changed by heat or pressure, minerals, naturally occurring inorganic matter, sedimentary, rocks that show layers from settling in water

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