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Unveiling the Power of Earth's Volcanic Eruptions

Delve into the creation of earthquakes, tsunami formation, and volcanic eruptions. Discover the similarities and differences in P, S, and surface waves, as well as the destructive and creative forces of volcanoes. Explore magma versus lava, convergent and divergent boundaries, and explosive or nonexplosive eruption types. Learn about pyroclastic flows, hot spots, and the dynamic processes shaping our world.

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Unveiling the Power of Earth's Volcanic Eruptions

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Presentation Transcript

  1. Daily Review #6 • How are earthquakes created? • How are P, S and surface waves similar? Different? • What is a tsunami and how is it made?

  2. Volcanic Eruptions • 10,000 times stronger than atomic bomb • Volcanoes – what are they? • Destructive • Creative

  3. What’s Inside? • Magma vs. lava • Magma chamber • Vents

  4. Convergent Boundaries • Subduction • Oceanic subducted • Produces magma • Magma rises to form volcano

  5. Explosive Eruptions • Rare • Destructive • Produce clouds of • Debris • Ash • Gas

  6. Pyroclastic Flows • Produced in small amounts of time, large amounts of material • Lahar • Faster than a hurricane • Temperatures greater than 700 deg. Celsius • Deadly

  7. Divergent Boundaries • Rift zone • Filled by magma • Mid-ocean ridges • Most volcanic activity • Iceland, island of Surtsey

  8. Nonexplosive Eruptions • Most common • Produce • Calm lava flows • Huge amounts of lava • Shape our world • Islands in the Pacific • Sea floor • NW U.S.

  9. Hot Spots • Examples • Volcanically active • Far from plate boundary • Theories • Mantle plumes • Cracks in crust • Move over time

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