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CHAPTER 4

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  • Describe the obsidian.
    Shiny black rock with sharp edges.
  • Say two types of igneous rocks.
    Pumice, obsidian, granite etc.
  • What are the three classifications of rocks?
    Igneous, sedimentary and metamorphic.
  • Say one use of the obsidian.
    Jewelry, hunting weapons etc.
  • Name two uses of rocks.
    constructions, jewelry, streets, decoration etc.
  • How are igneous rocks formed?
    When magma cools, it hardens and become a solid rock.
  • Define minerals.
    inorganic substances
  • Say one use of pumice in our everyday lives.
    skin care products, teeth-cleaning products etc.
  • Define rock.
    Hard (solid) material that composes the earth's crust.
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