Rocks and Its Types: Igneous, Sedimentary and Metamorphic Rocks

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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

Igneous rock

Igneous Rock

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

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

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