NATSCI4_Rocks

• Rock is a naturally-occurring aggregate of one or more minerals
• Rocks may or may not contain natural glass and organic matter
• Rocks are classified by

  1. mineral and chemical composition
  2. texture of the constituent particles
  3. processes that formed them
• Classification of rocks are

  1. Igneous
  2. Sedimentary
  3. Metamorphic
• Igneous rocks are formed from solidification of magma (intrusive) or lava which flows out from depths (extrusive)
• In Igneous rocks, Ignis means fire
• Intrusive igneous rocks form when molten rock cools slowly beneath Earth's surface.
• Magma is the molten rock generated by partial melting of rocks in Earth’s upper mantle and in the lower crust in smaller amounts.
• The temperature of a molten rock is 600-1200 degree Celsius
• Magma is measured by its

  1. Silica content
  2. Temperature
  3. Viscosity