2. What is a Volcano? Definition Lava Magma 1. Low-silica 2. High-silica

3. Volcanic Eruptions Quiet eruption 1. Low gas 2. Lava flows

4. Volcanic Eruptions (cont.) Explosive eruption 1. High gas 2. Tephra 3. Particle size

5. Types of Volcanoes Shield volcanoes 1. Low-silica 2. Lava flows 3. Description

6. Types of Volcanoes (cont.) Cinder cone volcanoes 1. Low-silica/high gas 2. Fire fountains 3. Tephra 4. Description

7. Types of Volcanoes (cont.) Composite volcanoes 1. High-silica 2. Lava flows/tephra 3. Description

9. Volcano Locations Divergent boundaries 1. Rifts 2. Low-silica 3. Mid-ocean ridge Surtsey

10. Volcano Locations (cont.) Convergent boundaries 1. Subduction zones 2. High-silica 3. Ring of Fire