Vocabulary # 14 - Earth's Rocks and Soil

Rock: a naturally formed solid in the crust, made up of one or more minerals.



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 of 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 sil.

     

Pollution: adding any hrmful substances to Earth's land, water, or air.

     

Rock cycle: rocks changing from one form into another in a never-ending series of processes.