Coach Williams Room 310B. Volcanoes Objectives: 1.Describe the major parts of a volcano....
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Transcript of Coach Williams Room 310B. Volcanoes Objectives: 1.Describe the major parts of a volcano....
Earth ScienceCoach Williams
Room 310B
Volcanoes
Chapter 18
Objectives:1. Describe the major parts of a volcano.2. Compare/contrast shield, cinder-cone, and
composite volcanoes.3. Contrast the volcanism that occurs at plate
boundaries.4. Explain the relationship between volcanism and
hot spots.
Section 18.3: Volcanoes
Volcano: mountain of cooled lava Vent: opening in crust Crater: bowl shaped depression Calderas: larger depressions
Anatomy of a Volcano
Shield: broad, gentle slope. Circular base Cinder-Cone: steep sides. Smaller Composite: fragments layered with lava.
◦ Larger
Types of Volcanoes
Types of Volcanoes
Tephra: rock fragments thrown in air◦ Dust: <2mm◦ Ash: >2mm◦ Lapilli “little stones”: rock size◦ Volcanic blocks: large, angular◦ Volcanic bombs: large rounded
Pyroclastic flows: deadly flow of volcanic material (gas, ash, tephra)
Volcanic Materials
Most at plate boundaries 80%: convergent boundaries 15%: divergent boundaries Hot spots: hot regions of Earth’s mantle
◦ Volcanoes far from plate boundaries
Where Volcanoes Occur
Where Volcanoes Occur
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