Rock Types

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  • Rock Types
    • Igneous
      • Formation
        • 'born of fire'
        • Intrusive or extrusive
      • Characteristics
        • Impermeable
        • hard
        • Resistant to erosion
        • Crystalline (intrusive)
      • Features
        • Crystals
        • Different coloured minerals
        • Interlocking crystals
        • Texture - fine extrusive. coarse intrusive
      • Example
        • Granite
        • Basalt
    • Sedimentary
      • Formation
        • compaction and cementation of sediment
        • Fossils
        • Calcium Carbonate
      • Characteristics
        • physically hard
        • chemicallyweak
        • friable
        • permiable
      • Features
        • white/grey
        • cracks/joints
        • bedding planes
        • steep/cliffs
      • Example
        • Chalk
        • Limestone
    • Metamorphic
      • Formation
        • alteration of pre-existing rocks under intense heat/pressure
      • Characteristics
        • Crystalline
        • Layering called cleavage
        • physically tough
        • chemically strong
        • Resistant to erosion
      • Features
        • Crystals
      • Example
        • Slate
        • Gneiss

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