oaioai:dlese.org:TIPS-000-000-000-149

Comment on Rock Formation (title provided or enhanced by cataloger)

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    Publication date
    2013
    Publisher
    Digital Library for Earth System Education, University Corporation for Atmospheric Research

    Abstract

    I have issue with this one part: "Explain that igneous rocks are those that are fire-made or volcanic rocks. They have small mineral pieces because they cooled quickly. Display trays of graphite so the students can see the large crystals in obsidian and explain that this looks like it contains pieces of glass. " As you know some igneous rocks are plutonic and have large crystals. Offer an example of a plutonic rock, too. Obsidian IS glass, not pieces of glass. Use obsidian without any impurities. What are the large crystals in it?? What is the graphite about?

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    Last time updated on 11/12/2013

    This paper was published in Digital Library for Earth System Education.

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