Introduction to Classification of Rocks Using the Building Stones of the Brooklyn College Campus

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چکیده

 Igneous Rocks form from the solidification of molten rock. Intrusive igneous rocks are composed of crystals that are large enough to be seen with the naked eye because these rocks cooled slowly, deep within the Earth thereby allowing time for the crystals to grow. In contrast, extrusive (volcanic) igneous rocks cool very quickly after they erupt from a volcano, and so are composed of microscopic crystals. Most volcanic rocks make poor building stone because they may be weak, cracked, inconsistent in color, and/or contain large pores. Accordingly, volcanic rocks will not be discussed further in this lab.

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تاریخ انتشار 2012