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1) Types of Volcanoes 2) What is magma made of?. Composition (What something is made of). Determined by the where it is formed “geologic setting” Determines what it is made from Mixture of SiO 2 , Fe, Mg and other elements. Amount of SiO 2 in the magma determines : Type Viscosity

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1 types of volcanoes 2 what is magma made of

1) Types of Volcanoes2) What is magma made of?


Composition what something is made of
Composition (What something is made of)

  • Determined by the where it is formed

    • “geologic setting”

      • Determines what it is made from

  • Mixture of SiO2, Fe, Mg and other elements.

  • Amount of SiO2 in the magma determines:

    • Type

    • Viscosity

    • Gas release ability


What kind of rocks form
What kind of rocks form?

Why is it called lava??? I thought it was magma…


Shield volcanoes
Shield Volcanoes

  • Broader

  • Not explosive

  • Constant gas release

    • Why do you think it is not explosive (hmm)?

  • High Viscosity

    • Flows really well so you get broad short volcano


Cinder cones
Cinder Cones

  • Steep

  • More explosive

  • Gases trapped

  • Viscosity

    • What do you think…

      • Higher or lower than

        Shield?


Stratovolcanoes
Stratovolcanoes

  • Steepest

  • large and explosive

  • Symmetric

  • Gases trapped

  • Tallest

  • At subduction zones

    • Mt. Fuji, Japan

    • Mt. Pinatubo, Philippines

    • Mt. Rainier, Washington

  • Viscosity?



Attention check time
Attention Check Time

1) If you want to make yourself a Hawaiian Shield Volcano at home what would be a good substitute for the viscosity of magma that it has?

A) Syrup

B) Water

C) Molasses

D) there shouldn’t be any magma

2) Which volcanoes are the most explosive?

3) Why are they so explosive (what are 2 things they have in common)?

4) Can you think of a way to make a volcano more explosive?


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