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Types of Rocks

 Rocks are categorized into 3 types on the base of the mode of formation they are

  1. Igneous Rocks
  2. Sedimentary Rocks
  3. Metamorphic Rocks

Igneous Rocks:

  • Igneous Rocks are formed from the magma and lava From the interior of the earth
  • When Magma cools and solidifies Igneous rocks are formed. This process can happen in earth crust or on the surface of the earth
  • If molten material cooled slowly at great depth mineral grains may be very large. sudden colling results in small and smooth grains .

Sedimentary Rocks:

  • Rocks of the earth's surface area exposed to denudational agents and are broken up into different size fragments. These fragments are transported by different exogenous agents and deposited. This deposition turns into rocks.
  • Depending on the mode of formation sedimentary rocks are classified into three types.
mechanically formed
  • Examples: sandstone, conglomerate, limestone, etc.
organically formed
  • Example: chalk, limestone, coal, etc.
chemically formed
  • Example: potash, limestone, halite, etc.

Metamorphic Rocks :

  • Metamorphic rocks are formed under the great volume of pressure and temperature changes.
  • Metamorphism is a process by which already consolidated rocks undergo recrystallization and reorganization of material within the original rocks.

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