Rocks and Its Types: Igneous, Sedimentary and Metamorphic Rocks

Dr. Manishika Jain- Join online Paper 1 intensive course. Includes tests and expected questions.

Rock

Hard mass of mineral matter comprising of two or more rock forming mineral

Based on mode of formation, rocks are of three types:

  • Igneous or primary rocks

  • Sedimentary rocks

  • Metamorphic rocks

Igneous Rock

Classification of Igneous rock

Classification of Igneous Rock

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Igneous rock

Igneous Rock

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Sedimentary Rocks

Classification of Sedimentary Rocks

Based on origin, these are of two types:

i) Fragmental, detrital, or mechanically formed

ii) Chemically formed

  • Inorganically formed

  • Organically or Biologically formed

Formation of Sedimentary Rocks

Four steps involved in the formation of sedimentary rocks are:

i) Weathering

ii) Transportation

iii) Deposition and Sedimentation

iv) Diagenesis

Metamorphic Rocks

Classification of Metamorphic rocks

Metamorphic Rocks

Metamorphic Rocks

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Formation of Metamorphic Rocks

  • Thermal metamorphism

  • Dynamo Thermal metamorphism

Multiple Choice Questions

1. Which among the following is a type of acid Igneous Rock?

  1. Granite

  2. Basalt

  3. Gabbro

  4. Andesite

Answer: a

2. Transformation of unconsolidated sediment to hard rock is known as

  1. Diagenesis

  2. Weathering

  3. Hardening

  4. Deposition

Answer: a

3. Marble is a

  1. Foliated metamorphic rock

  2. Sedimentary rock

  3. Unfoliated metamorphic rock

  4. None of the above

Answer: c

4. Extrusive rocks are formed by

  1. Heat and pressure

  2. Temperature

  3. Magma

  4. Lava

Answer: d

#Rocks and Its Types

#UGC NTA NET

#Igneous rock

#Sedimentary rock

#Metamorphic rock

#Classification and Formation