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Shale, from which shale gas is produced, is a type of
1. Sedimentary rock
2. Igneous rock
3. Metamorphic rock
4. None of the above

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Correct Answer - Option 1 : Sedimentary rock

The correct answer is Sedimentary rock.

  • Sedimentary rock is a type of rock that has been formed in strata.
  • Fossil is found in these types of rocks.
  • Formed by deposition of mineral or organic particles followed by cementation.
  • They are classified into 3 types-
    • Mechanically formed - conglomerate, limestone, shale, sandstone
    • Organically formed - limestone, coal
    • Chemically formed - potash

  • Igneous rocks-
    • forms when magma solidifies.
    • Intrusive - when solidifies inside the surface of Earth.
    • Extrusive - when solidifies on the surface of Earth.
    • Granite, gabbro, basalt.
  • Metamorphic rocks-
    • changes due to extreme heat and pressure
    • Slate (from clay), schist (from shale), marble (from limestone), quartzite (from sandstone).

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