Vocabulary #10

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

2.Igneous rock: A rock formed when melted rock material cooled and hardness

3.Sedimentary rock: A rock made of bitts of matter joined together.

4.Fossil. A ny remain or imprinted of living things of the past.

5.Metamorphic rock: A rock formed under heat and pressure form another kind of rock.

6.Humus: Decayed plant or animal material and soil.

7.Polution: Adding any hamful substances to earth land,water or air.

8.Rock cycle: R ock"s changing from one form into another in a never ending series of process.