Igneous Rock: a rock formed when melted rock material cools and hardens.
Sedimentary Rock: a rock made of bits of matter joined together.
Fossil: any remains or imprint of living things of the past.
Metamorphic Rock: a rock formed under heat and pressure from another kind of rock.
Humus: decayed plant or animal material in soil.
Pollution: adding any harmful substances to Earth´s land,water,or air.
Rock Cyccle: rocks changing from one form into anther in a never-ending series of process.
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