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Learn about P-waves vs. S-waves, volcano formation, eruption triggers, magma properties, volcano parts, and different volcano types like shield, cinder cones, and composite cones.

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  1. DO NOW Get out your waves homework What are two differences between P waves & S waves? Which type of wave reaches a location first?

  2. What do you know about volcanoes?

  3. What causes volcanoes to erupt? • Magma composition • Magma temperature • Amount of dissolved gases in the magma

  4. Parts of a Volcano

  5. Pyroclastic Material • The volcanic rock or other material ejected during an eruption

  6. Types of Volcanos • Shield Volcanoes • made of fluid basaltic lava flows • Small amount of pyroclastic materials • Example: Hawaii

  7. Types of Volcanos • Cinder Cones • Ejected laval fragments harden in the air and build a cinder cone • Gas rich basaltic magma • Example: Flagstaff, AZ

  8. Types of Volcanos • Composite Cones • Symmetrical • Both Lava & Pyroclastic Deposits • Most Explosive eruptions • Example: Ring of Fire

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