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formed from broken up pieces of rock called sediment that have been compacted over thousands of years; has layers; can contain fossils
formed from lava or magma that has cooled and hardened; usually dark colored; contains holes called pores
formed when igneous or sedimentary rocks are changed by heat or pressure; has crystals and streaks of light and dark
has the smallest particles; holds water and nutrients well; often used for making pottery because of its texture
a mixture of sand, clay, and silt; ideal for gardening because it contains nutrients and moisture
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