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Intrusive and Extrusive Igneous Rocks (Grade 9)

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Intrusive and Extrusive Igneous Rocks

Volcanic, or extrusive rocks, result when magma cools and crystallizes slowly within the Earth's crust.
  1. True
  2. False
Intrusive igneous rocks are formed from cooled magma below the surface.
  1. True
  2. False
Volcanic or extrusive rocks, result from magma reaching the surface either as lava or fragmental ejecta.
  1. True
  2. False
Rhyolite and granite often look very similar. However, the difference is that rhyolite formed intrusively and granite formed extrusively.
  1. True
  2. False
Igneous rocks that are formed outside of the Earth are                          and will usually have                                        because the rate of cooling was                .
Igneous rocks that are formed inside the Earth are                          and usually have                    crystals because the rate of cooling is                   .
A large irregular mass of intrusive igneous rock that has melted or forced itself into surrounding rock layers is called a                .
  1. dike
  2. laccolith
  3. sill
  4. batholith
An domed igneous intrusion that has been injected between two layers of sedimentary rock would be referred to as a                .
  1. dike
  2. laccolith
  3. batholith
  4. sill
Identify each of the following as either an intrusive (I) or extrusive (E) igneous rock. Write either I or E on the blank line.

           1. Granite

           2. Obsidian

           3. Pumice

           4. Andesite

           5. Rhyolite

           6. Tuff

           7. Diorite

           8. Pegmatite

           9. Gabbro

           10. Scoria
Write a paragraph that explains the difference between intrusive and extrusive igneous rocks. Incorporate the following words into your paragraph: INTRUSIVE, EXTRUSIVE, VOLCANO, PLUTON, CRYSTAL(S), MAGMA, LAVA, MINERAL(S)

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