igneus rock: a rock formed when melted rock material cools and hardness.
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.
humus: decayed plant or animal material in soil.
pollution: adding any harmful substances 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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