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,

Rocks

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