Volcanic Eruptions (or Volcanoes are Cool)

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Presentation transcript:

Volcanic Eruptions (or Volcanoes are Cool) Types of Eruptions. Types of Volcanoes. Volcanoes and Plate Tectonics. 11/29/2018

Eruptions are Classified as: Quiet………or Violent! 11/29/2018

Quiet Eruptions 11/29/2018

Violent Eruptions 11/29/2018

What causes quiet or violent eruptions? The amount of silica in the magma. The amount of water in the magma. Other gases in the magma. 11/29/2018

Basaltic Magma Magma composed of basalt. Contains small quantities of water and other gases. Contains small quantities of silica. Minerals contain quantities of iron. Typically quiet eruptions. 11/29/2018

Granitic Magma Magma is composed of granite. Contains large quantities of silica. Contains water and other gases. This magma is highly viscous. Eruptions are typically violent. 11/29/2018

Types of Volcanoes: quiet eruptions… Shield volcanoes Galapagos Island 11/29/2018

Shield Volcanoes Mona Loa, Hawaii 11/29/2018

Shield Volcanoes Volcanoes of Mars 11/29/2018

Shield Volcanoes Powerline, Hawaii Fumarole Butte, Utah 11/29/2018