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How and Where Volcanoes Form

How and Where Volcanoes Form. Quick Review. What is magma? Why does magma rise? At what kind of plate tectonic boundary/ boundaries do we find volcanoes? Why do volcanoes form here?. Definition of Volcano.

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How and Where Volcanoes Form

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  1. How and Where Volcanoes Form

  2. Quick Review • What is magma? • Why does magma rise? • At what kind of plate tectonic boundary/ boundaries do we find volcanoes? • Why do volcanoes form here?

  3. Definition of Volcano • Volcano: Both an opening in Earth’s crust through which molten rock, gases and ash erupt and the landform that develops around this opening

  4. Magma Formation 1. Decreasing pressure can lower the melting temperatures of materials in the asthenosphere (ex. Rift valley/mid-ocean ridge) 2. Increasing temperatures can cause materials in the asthenosphere to melt. (ex. Hot spot) 3. Increasing water in the asthenosphere can lower melting temperatures (ex. Subduction boundaries)

  5. Rise to the Top • Magma tends to rise to the surface because it is less dense than the solid material surrounding it • The traits of the magma and the rate at which is rises depends on the amount of silica

  6. Put this chart in your notes!!

  7. VIDEO • https://www.youtube.com/watch?v=K7Oq9_DU1Mc • SciShow Kids All About Volcanoes

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