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Volcano. The Tick ET Volcano on Venus How Volcanoes Erupt Gases dissolved in magma rush out, carrying the magma with them. Magma Chamber Pipe(Sill.

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Presentation on theme: "Volcano. The Tick ET Volcano on Venus How Volcanoes Erupt Gases dissolved in magma rush out, carrying the magma with them. Magma Chamber Pipe(Sill."— Presentation transcript:

1 Volcano

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3 The Tick ET Volcano on Venus

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5 How Volcanoes Erupt Gases dissolved in magma rush out, carrying the magma with them. Magma Chamber Pipe(Sill – Dike) Vent Lava Flow – Pyroclastic Flow – Ash Crater

6 Generic Volcano

7 Strato Volcano Ash Lava Pyroclastic

8 Ash Eruptions

9 Characteristics of Magma Its all about the Silica! Lots of Silica – thicker, stickier, lighter Not much Silica – smoother,darker Question – What kind is Hawaiian lava?

10 Rhyolite High Silica

11 Pumice High Silica Lots of gas

12 Obsidian Mafic or Felsic? Oops, now in English, lots of Silica or not much? (tricky!!!)

13 Basalt Low Silica Dark Dense

14 Pahoehoe High or low silica??

15 Aa High or low Silica?

16 Slow cooling Basalts Columnar basalt – cools slow – this one is also a volcanic neck

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18 Eroded Interiors Volcanic neck and Dike of a volcano The rest has eroded away – So you can see the interior

19 Types of Volcanic Eruptions Quiet – Hawaiian Style –Pahoehoe – Aa Explosive – Mt St Helens, Vesuvius

20 Stages Active Dormant Extinct

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