VOCABULARY:
rock: a natural formed solid in the crust.
igneous rock: rock formed when it melts and then cools.
sedimentary rock: rock made of bits of matter joined together.
fossil: any remains or prin of living things ofthe past.
metamorphic rock: a rock formd under heat and pressure from another kind of rock.
humus: decayed plant or animal material in soil.
pollution: adding any harmful substance to earth´s land, water, or air.
rock cycle: rocks changing from one form into another in a never-ending series of process.
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