Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Volcanic Eruptions and Climate Change During a large-scale volcanic.

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Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Volcanic Eruptions and Climate Change During a large-scale volcanic eruption, enormous amounts of volcanic ash and gases are ejected into the upper atmosphere. As volcanic ash and gases spread throughout the atmosphere, they can block enough sunlight to cause global temperature to drop. Other effects of volcanic eruptions are shown in the following Visual Concepts presentation. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Effects of Volcanoes on Earth Section 2 Effects of Volcanic Eruptions Click below to watch the Visual Concept. You may stop the video at any time by pressing the Esc key. Visual Concept Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Different Types of Volcanoes Volcanic eruptions can cause profound changes in climate, but the changes to the Earth’s surface are more familiar. Perhaps the best known of all volcanic landforms are the volcanoes themselves. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Different Types of Volcanoes, continued There are three basic types of volcanoes: Shield Volcanoes Cinder Cone Volcanoes Composite Volcanoes Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Different Types of Volcanoes, continued Shield volcanoes are built of layers of lava that are released from repeated nonexplosive eruptions. The lava spreads out over a wide area, creating a volcano with gently sloping sides. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Different Types of Volcanoes, continued Cinder cone volcanoes are made of pyroclastic material usually produced from moderately explosive eruptions. The pyroclastic material forms steep slopes. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Different Types of Volcanoes, continued Composite volcanoes are formed from explosive eruptions of pyroclastic material, followed by quieter flows of lava. These formations, among the most common types of volcanoes, have broad bases and sides that get steeper toward the top. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Other Types of Volcanic Landforms In addition to volcanoes, there are other landforms produced by volcanic activity. Craters are funnel-shaped pits near the top of the central vent of a volcano. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Craters Section 2 Effects of Volcanic Eruptions Click below to watch the Visual Concept. You may stop the video at any time by pressing the Esc key. Visual Concept Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Other Volcanic Landforms, continued Calderas are large, semicircular depressions that form when the magma chamber below a volcano partially empties and causes the ground above to sink. Calderas can appear similar to craters, but are many times larger. Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 Effects of Volcanic Eruptions Chapter F6

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Other Volcanic Landforms, continued Lava Plateaus are wide, flat landforms that result form repeated nonexplosive eruptions of lava that spread of a large area. The lava that formed lava plateaus usually erupted from long cracks, or rifts, in the crust over a period of millions of years. Section 2 Effects of Volcanic Eruptions Chapter F6

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