About This 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
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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.
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.
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
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.
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.
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.
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.
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Other chapters within the Holt McDougal Earth Science: Online Textbook Help course
- Holt McDougal Earth Science Chapter 1 - The World of Earth Science
- Holt McDougal Earth Science Chapter 2 - Maps as Models of the Earth
- Holt McDougal Earth Science Chapter 3 - Minerals of the Earth's Crust
- Holt McDougal Earth Science Chapter 4 - Rocks: Mineral Mixtures
- Holt McDougal Earth Science Chapter 5 - Energy Resources
- Holt McDougal Earth Science Chapter 6 - The Rock and Fossil Record
- Holt McDougal Earth Science Chapter 7 - Plate Tectonics
- Holt McDougal Earth Science Chapter 8 - Earthquakes
- Holt McDougal Earth Science Chapter 10 - Weathering and Soil Formation
- Holt McDougal Earth Science Chapter 11 - The Flow of Fresh Water
- Holt McDougal Earth Science Chapter 12 - Agents of Erosion and Deposition
- Holt McDougal Earth Science Chapter 13 - Exploring the Oceans
- Holt McDougal Earth Science Chapter 14 - The Movement of Ocean Water
- Holt McDougal Earth Science Chapter 15 - The Atmosphere
- Holt McDougal Earth Science Chapter 16 - Understanding Weather
- Holt McDougal Earth Science Chapter 17 - Climate
- Holt McDougal Earth Science Chapter 18 - Studying Space
- Holt McDougal Earth Science Chapter 19 - Stars, Galaxies, and the Universe
- Holt McDougal Earth Science Chapter 20 - Formation of the Solar System
- Holt McDougal Earth Science Chapter 21 - A Family of Planets
- Holt McDougal Earth Science Chapter 22 - Exploring Space