Ch 7: Igneous Rocks

About This Chapter

Watch informative and engaging online Earth science video lessons with quick quizzes for immediate feedback. Learn all about the various aspects of igneous rocks.

Igneous Rocks - Chapter Summary and Learning Objectives

You might be most familiar with igneous rocks when they are talked about along with sedimentary and metamorphic rocks. These three types of rocks are all unique, though. That is why we dedicated this chapter to just igneous rocks. This type of rock is often called the fire rock. They are usually formed from magma. They are also the oldest type of rock. In these lessons, you will get to know the igneous rock very well. Our lessons will help you understand how they form, where they form and what they have to share with us about Earth. Some of the things you will learn about in this chapter include:

  • The origins of magma
  • Volcanic vs. plutonic igneous rocks
  • The crystallization process
  • Magmatic differentiation
  • Igneous rock classification
  • Plate boundaries and igneous rocks

VideoObjective
Magma: Definition, Lesson & Quiz Explore the origins of magmas, including discussions on heat and geothermal gradient, pressure, composition of partially melted rock and volatiles.
Volcanic vs. Plutonic Igneous Rocks: Definition and Differences Discuss the differences between volcanic and plutonic igneous rocks, with a discussions of vocabulary including plutons and batholiths, dikes and sills.
Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation Examine the continuous and the discontinuous series of Bowen's Reaction Series.
Classification of of Igneous Rocks: Textures and Composition Analyze the different textures of igneous rocks, and explain the physical processes that produce them.
Locating Igneous Rocks: The Relationship Between Igneous Rocks & Tectonic Plates Take a look at the relationship between igneous rocks and plate boundaries.

5 Lessons in Chapter 7: Igneous Rocks
Test your knowledge with a 30-question chapter practice test
Magma: Definition & Formation

1. Magma: Definition & Formation

Magma is molten rock found below the earth's surface. The temperature at which a rock melts is affected by its composition, pressure and water. Learn how magma forms and how it either feeds volcanoes or cools and crystallizes into igneous rock.

Volcanic vs Plutonic Igneous Rocks: Definition and Differences

2. Volcanic vs Plutonic Igneous Rocks: Definition and Differences

Volcanic and plutonic rocks are types of igneous rock. Volcanic rocks form when lava cools and solidifies on Earth, and plutonic rocks form when magma cools and solidifies below Earth. Learn about different characteristics of these igneous rocks.

Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation

3. Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation

Bowen's reaction series and magmatic differentiation are two ways of explaining how igneous rocks form. Learn about the continuous and discontinuous series of the Bowen's reaction series and how magmatic differentiation works in this video lesson.

Classification of Igneous Rocks: Textures and Composition

4. Classification of Igneous Rocks: Textures and Composition

Igneous rocks can be classified by their texture and composition. Learn how texture is influenced by the cooling rate of magma and how different mineral compositions lead to different igneous rock classifications in this video lesson.

Locating Igneous Rocks: The Relationship Between Igneous Rocks & Tectonic Plates

5. Locating Igneous Rocks: The Relationship Between Igneous Rocks & Tectonic Plates

Igneous rock can form where tectonic plates diverge or converge. Learn how the movement of tectonic plates can create the right conditions of the solidification of magma and the formation of igneous rocks.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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