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 transcript:

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 – Dike) Vent Lava Flow – Pyroclastic Flow – Ash Crater

Generic Volcano

Strato Volcano Ash Lava Pyroclastic

Ash Eruptions

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?

Rhyolite High Silica

Pumice High Silica Lots of gas

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

Basalt Low Silica Dark Dense

Pahoehoe High or low silica??

Aa High or low Silica?

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

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

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

Stages Active Dormant Extinct