Classification of Rocks Quiz

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Questions and Answers

What is rock?

A naturally occurring solid aggregate of minerals and sometimes nonmineral solid particles.

Which type of rock is formed from the cooling and solidification of magma or lava?

  • Metamorphic rocks
  • Sedimentary rocks
  • Igneous rocks (correct)
  • None of the above

Intrusive igneous rocks are formed from the solidification of magma ______ the surface.

below

Name two examples of intrusive igneous rocks.

<p>Granite and diorite.</p> Signup and view all the answers

Which type of igneous rock is formed at a faster rate on the Earth's surface?

<p>Extrusive igneous rocks (A)</p> Signup and view all the answers

What is sedimentary rock formed by?

<p>Deposition and cementation of mineral or organic particles.</p> Signup and view all the answers

Which of the following is NOT a classification of sedimentary rock?

<p>Igneous (A)</p> Signup and view all the answers

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Study Notes

Classification of Rocks

  • Rocks are aggregates of minerals and may include nonmineral components.

Igneous Rocks

  • Formed through the cooling and solidification of magma or lava.

Intrusive Igneous Rocks

  • Solidified from magma beneath the Earth's surface.
  • Characterized by large mineral crystals due to slow crystallization.
  • Examples include:
    • Granite
    • Diorite
    • Gabbro
    • Pegmatite
    • Peridotite

Extrusive Igneous Rocks

  • Formed from the rapid solidification of lava on the Earth’s surface.
  • May appear glassy due to reduced crystallization or contain vesicles (air bubbles).
  • Examples include:
    • Scoria (vesicular texture)
    • Andesite
    • Basalt
    • Dacite
    • Obsidian
    • Pumice
    • Rhyolite
    • Tuff

Sedimentary Rocks

  • Created by the deposition and cementation of mineral or organic particles.
  • Typically form at the bottom of oceans and other bodies of water.
  • Classified into three types:
    • Clastic
    • Chemical
    • Organic

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