Rock Types
- Created by: Sara Griffiths
- Created on: 03-06-13 19:44
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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
- Formation
- 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
- Formation
- 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
- Formation
- Igneous
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