1. Volcano Types and Types of Lava Volcano types Shield Composite Caldera Lava types Low silica High Silica

2. Volcano Types and Types of Lava Lava Types Silica: SiO2 – Silica is the main component of glass – Amount of it in lava determines if lava is low or high in viscosity (runny or thick and gooey) Low Silica Lava – Runny, flows freely High Silica Lava – Gooey, Oozes High Silica Lava

3. Volcano Types and Types of Lava Volcano types Shield Volcanoes – Short broad volcanoes – Low silica lava – Not explosive – Examples: Mt Kiluaea in Hawaii

4. Volcano Types and Types of Lava Volcano types Composite Volcanoes – Tall Moutains – Medium to high silica lava – Explosive Pyroclastic flows – End of the world type stuff – Examples: Mt Saint Helens, Mt. Pinatubo, Mt. Vesuvius

5. Volcano Types and Types of Lava Volcano types Calderas – Formed when a large composite volcano erupts and caves in on itself – Forms large depressions – Examples: Yellowstone depression