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- Lustre or shininess depends on light reflected from mineral's surface. A mineral can have a metallic and non-metallic lustre
- Rocks are made up of crystalline materials called minerals
- Different minerals can be identified based on lusture, colour, streak, cleavage fracture, and hardness
- Cleavage fractureWhether a mineral breaks along smooth and flat surfaces or with rough and jagged edges
- Colour is the most attractive, but minerals can change colour
- Rocks and Minerals?
- Streak minerals can be differentiated based on their streak on porcelain tile
- Moh's Hardness scaleScratchability can be used to identify minerals on a scale of 1 to 10
- Intrusive RocksWhen Magma cools and hardnes under the surface of earth or lava
- Igneous Rocksare formed upon cooling of hot Magma
- Magma is melted rock found deep in the earth crust
- Extrusive RocksWhen lava cools on earth's surface
- Metamorphic RocksWhen the originial or parent rock change form due to high heat and pressure below earth's surface
- Rocks can be sedimentary, igneous or metamorphic
- Sedimentary rocks are made of sediments like minerals, remains of plants and animals, which forms layers (stratification). These layers get compacted due to weight of sediments. Water soaks minerals which act as cement to stick particles together (cementation).
- Weathering and erosion
- CHEMICAL weathering breaks down rocks and minerals through chemical reaction. CHEMICAL weathering
- The three types of weathering are Chemical,Biological,Mechanical.
- Igneous Rocks
- Sedimentation
- Rock Cycle
- Cooling
- Biological weathering is physical or chemical breakdown of rock causing by living organisms.
- Deposition, compaction cementation
- Magma
- Metamorphic rock
- Melting
- Sedimentary rock
- Chemical weathering physical break up or disintegration of rocks.
- Weathering is the process rocks are broken down. There are types of weathering that's how semimat are formed.
- Erosion is the Movement of rock or mineral grains from one place to another.
- Heat pressure
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