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Ch 9: Holt McDougal Earth Science Chapter 9 - Volcanoes

About This Chapter

The Volcanoes chapter of this Holt McDougal Earth Science Online Textbook Help Course helps students learn essential earth science lessons on volcanoes. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Volcanoes textbook chapter.

How it works:

  • Identify the lessons in the Holt McDougal Volcanoes chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the volcanoes topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Volcanic eruptions
  • Flow of pyroclastic materials
  • Lava flow, pyroclastic surge and tephra
  • Volcanic landform formation
  • Shield, cinder cone and composite cone volcanoes
  • Magma

Holt McDougal is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

7 Lessons in Chapter 9: Holt McDougal Earth Science Chapter 9 - Volcanoes
Test your knowledge with a 30-question chapter practice test
What is a Volcano? - Definition & Eruptions

1. What is a Volcano? - Definition & Eruptions

Volcanoes are vents that allow lava, rock fragments and gases to escape from layers beneath the earth's surface. Learn how volcanoes form both on land and underwater and why they erupt.

The Flow of Pyroclastic Materials

2. The Flow of Pyroclastic Materials

A pyroclastic flow is the flow of volcanic ash, gases and fragments following a volcanic eruption. Learn about the types of pyroclastic flows and the materials that make them up and contribute to their fluid nature.

Lava Flow, Pyroclastic Flow, Pyroclastic Surge & Tephra: Preventing Volcanic Hazards

3. Lava Flow, Pyroclastic Flow, Pyroclastic Surge & Tephra: Preventing Volcanic Hazards

Volcanic hazards are any type of volcanic process that leads to destruction or threatens life. Learn about specific volcanic hazards including lava flows, pyroclastic flows, pyroclastic surges and tephra and measures used to prevent or reduce damage

Volcanic Landforms: Types & Formation

4. Volcanic Landforms: Types & Formation

Volcanic eruptions pull materials up from deep within the earth to form various volcanic landforms, such as lava domes, lava plateaus, fissure eruptions, craters and calderas. Learn about these volcanic landforms and how they are created.

Types of Volcanoes: Shield, Cinder Cones & Composite Cones

5. Types of Volcanoes: Shield, Cinder Cones & Composite Cones

The earth ejects lava, rock fragments, hot vapor and gases during volcanic eruptions. Volcanoes vary based on size, shape, composition and eruptive style. Learn about the different types of volcanoes, such as shield, cinder cone and composite cone.

Magma: Definition & Formation

6. 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.

Cinder Cone Volcano: Definition, Facts & Examples

7. Cinder Cone Volcano: Definition, Facts & Examples

If you close your eyes and imagine a typical volcano, chances are you're thinking of a cinder cone. In this lesson, you'll find out how cinder cones grow, and learn about examples of this common landform.

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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