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Understanding Igneous Rocks: Classification & Characteristics

Learn about the classification of igneous rocks based on origin, mineral composition, and texture. Identify the differences between intrusive and extrusive rocks and explore key rock types like basalt and granite.

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Understanding Igneous Rocks: Classification & Characteristics

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  1. Question #1b Igneous rocks are classified by Origin, Mineral Composition, and _______. Hardness Texture Luster

  2. Question #1 Igneous rocks are classified in what three ways?

  3. Question #2 Igneous rock that forms INthe earth is ________. Igneous rock that forms when molten rock EXITSthe earth and then cools is ________.

  4. Question #3 A rock that has both large and small grains is called ________ . Porous Coarse-grained Porphyritic

  5. Question #4 The oceanic crust is made mainly from Basalt, which is cooled lava. Is Basalt intrusive or extrusive?

  6. Question #5 Which rock likely has the LEAST silica?

  7. Question #4b The continental crust is made mainly From Granite, which is cooled magma. Is Granite intrusive or extrusive?

  8. Answer Key • Question 1: Origin, Texture, Mineral Composition • Question 1b: Texture • Question 2: Intrusive, Extrusive • Question 3: Porphyritic • Question 4: Extrusive • Question 4b: Intrusive • Question 5: B

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