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Name_________________________________________ Section _________ Igneous Rocks: Notes Outline Holt Science & Technology Earth Science, Chapter 4: Section 3 I. Igneous Rocks – - What do igneous rocks come from? - What is a melting point? § Magma “_________________” between _____________ and __________ § The ________________________ of magma is ALSO between _____________ and _____________ § That means, ____________________________BECOME a solid and _________________ ___________________________ BECOME a liquid. II. Three Ways that Magma Can Form: 1. A Decrease in Pressure - 2. An Increase in Temperature – 3. A Change in Composition – Igneous Rocks: Notes Outline (continued) III. Texture § How is the texture of igneous rocks is a direct result of the rate at which the magma they were formed from cooled? § Explain what happens to the mineral crystals in igneous rocks if the magma they came from cooled slowly. § Describe what happens to the mineral crystals in igneous rocks if the magma they came from cooled quickly. A. Intrusive Igneous Rock – - Describe the rate at which intrusive igneous rocks cool and the texture they have: B. Extrusive Igneous Rock – - IV. Describe the rate at which extrusive igneous rocks cool and the texture they have: Three Ways that Igneous Rocks Can Form FROM Magma: (For each method listed, describe the rate at which the magma would cool and the resulting texture of the igneous rocks formed) 1. “Spew” out of a volcano – 2. “Ooze” out of a volcano – 3. Get trapped somewhere on the way up to the surface - Igneous Rocks: Notes Outline (continued) V. VI. Deciphering Earth’s History with Igneous Rocks (Describe how each of the three bullet points affects geologists ability to decipher Earth’s History) - The ocean floor is MADE from lava flows. - Pre-existing landforms are often buried by lava flows. - Geologists can identify rock that was formed from lava flows. Homework 1. Draw a picture of a volcano in the space below. Color it. 2. Label on the picture magma from which a fine-grained extrusive igneous rock will be formed. 3. Label on the picture magma from which a course-grained intrusive igneous rock will be formed. 4. Label on the picture magma from which a medium grained igneous rock might be formed.