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Ch 9: Volcanoes

About This Chapter

Watch online video lessons to learn what volcanoes are, the different forms they can take, and what can be done to alleviate some of the hazards associated with them. Each lesson is accompanied by a short multiple-choice quiz you can use to check your understanding of these volcanoes topics.

Volcanoes - Chapter Summary and Learning Objectives

Of all of the Earth's natural features, few are able to cause such sudden and dramatic changes as the volcano. Volcanoes can not only quickly change the landscape, they can also have devastating consequences for human life. In this chapter, video instructors introduce you to the nature and types of volcanic landforms. You'll learn the important vocabulary associated with this branch of earth sciences. By the end of this chapter, you should be able to:

  • Define 'volcano' and explain why volcanic eruptions occur
  • Name the three major types of volcanoes and identify their characteristics
  • Explain how the different types of volcanic landforms are formed
  • Explain what can be done to minimize the damage caused by volcanic eruptions

VideoObjectives
What is a Volcano? - Definition & EruptionsDescribe the nature of a volcano and volcanic eruptions
Types of Volcanoes: Shield, Cinder Cones, & Composite ConesCompare and contrast the three major types of volcanoes - shield volcanoes, cinder cones, and composite cones - considering size, composition, shape, and eruptive style
Volcanic Eruption Gases & Their EffectsIdentify the main gases released during an eruption, including water vapor, carbon dioxide, nitrogen, and sulfur dioxide, and describe the role these gases play in eruption
The Flow of Pyroclastic MaterialsDescribe the nature of pyroclasitc flow based on size, including ash, dust, welded tuff, and lapilli, as well as texture and composition such as scoria and pumice
Volcanic Landforms: Types & FormationIdentify various types of volcanic landforms, including fissure eruptions and lava plateaus, calderas and craters, and volcanic pipes (conduits) and necks. Discuss how these are formed
Volcanic Hazards: Definition, Types & PreventionDefine a volcanic hazard. Discuss the various types of volcanic hazards, such as volcanic earthquakes, directed blast, tephra, volcanic gases, lava flows, debris avalanches, landslides, tsunamis, pyroclastic surge, pyroclastic flows, and lahars. Describe some basic prevention methods

8 Lessons in 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.

Types of Volcanoes: Shield, Cinder Cones & Composite Cones

2. 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.

Volcanic Eruption: Gases Released & Their Effects

3. Volcanic Eruption: Gases Released & Their Effects

Volcanic eruptions emit water vapor and toxic gases into the atmosphere. Learn about the gases emitted from an erupting volcano, such as carbon dioxide, sulfur dioxide, hydrogen sulfide, hydrochloric acid and carbon monoxide and their effects in this video lesson.

Lava Flow: Definition & Types

4. Lava Flow: Definition & Types

This lesson defines lava and explores the different chemical distinctions of lava. By the end of this lesson, you should be able to name the different types of lava and some of its distinctive morphologies.

The Flow of Pyroclastic Materials

5. 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.

Volcanic Landforms: Types & Formation

6. 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.

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

7. 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 Hazards & Prevention: Landslides, Lahars & Tsunamis

8. Volcanic Hazards & Prevention: Landslides, Lahars & Tsunamis

Volcanic hazards are any volcanic process that can damage property or threaten life. Learn about volcanic hazards, such as landslides that can trigger lahars and tsunamis, and ways to prevent these hazards from threatening people's lives.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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