Igneous Rocks Quiz Questions -2

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| By Kristie
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Kristie
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Quizzes Created: 1 | Total Attempts: 952
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About This Quiz

This Igneous Rocks Quiz assesses understanding of magma and lava, differentiating between intrusive and extrusive rocks, crystal sizes, and mafic minerals. It's designed to enhance knowledge of rock formation processes, vital for students and enthusiasts in geology.

Igneous Rocks Quizzes & Trivia

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  • 2. 

    True or false: Intrusive igneous rocks are formed above the earth's surface.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Intrusive igneous rocks are formed below the earth's surface. They are formed when magma cools and solidifies slowly beneath the surface, allowing for the growth of large mineral crystals. This slow cooling process gives intrusive rocks their characteristic coarse-grained texture. Examples of intrusive igneous rocks include granite and diorite.

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  • 3. 

    Extrusive igneous rocks are characterized by ___________________ crystal size.

    Correct Answer
    small
    Explanation
    Extrusive igneous rocks are formed from lava that cools quickly on the Earth's surface. The rapid cooling prevents the crystals from growing large, resulting in small crystal size.

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  • 4. 

    Please fill answer below: Intrusive igneous rocks are characterized by _____________ crystal size.

    Correct Answer
    large
    Explanation
    Intrusive igneous rocks are formed when magma cools and solidifies beneath the Earth's surface. Due to the slow cooling process, these rocks have a longer period of time for the crystals to grow, resulting in larger crystal sizes. Therefore, intrusive igneous rocks are characterized by large crystal size.

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  • 5. 

    Check as many as apply: Mafic minerals include:

    • Pyroxene

    • Plagioclase fledspar

    • Olivine

    • Muscovite mica

    • Quartz

    Correct Answer(s)
    A. Pyroxene
    A. Olivine
    Explanation
    Mafic minerals are a group of minerals that are rich in magnesium and iron. Pyroxene and olivine are both examples of mafic minerals. Pyroxene is a group of dark-colored minerals that are commonly found in igneous and metamorphic rocks. Olivine is a green mineral that is often found in basaltic rocks. Plagioclase feldspar, muscovite mica, and quartz are not mafic minerals as they do not contain high amounts of magnesium and iron.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 17, 2013
    Quiz Created by
    Kristie
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