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Vulkaner

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on 8 November 2016

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Transcript of Vulkaner

Ann - Geologi
Jordens opbygning
Flere slags vulkaner
Der findes to forskellige slags magma
Spaltevulkaner ved Spredningszoner
Hotspotvulkaner

Vulkaner ved
Subduktionszoner
Vulkanbygninger
Skjoldvulkan
Stratovulkan
Hekla, Island
Eksplosiv
Vulkansk dome
Mount st. Helens
Eksplosiv
FORSØG
Lavas egenskaber
Vulkaner
Introduktion
Jordens opbygning
Forskellige slags vulkaner
FORSØG
Vulkanske bjergarter
Opsamling
Sæt sten på vulkanen
- Meget let
- Mange vesikler
- Dannet i eksplosivt udbrud
Vulkansk aske
Pimpsten
Obsidian
Tyndflydende
Kan indeholde få krystaller
Granit
Basalt
Vulkansk aske
Pimpsten
Rhyolit + obsidian
Rhyolit
- Store krystaller
- Størkner i magmakammeret
Granit
Indre kerne
Ydre kerne
Nedre kappe
Øvre kappe
Skorpe
Mount St. Helens
Kilauea, Hawaii
Effusiv
Basalt
- Meget finkornet
- En askesky kan blive op til 50 km høj
- Tyktflydende lava
- Kan indeholde krystaller
- Altid sort
- Vulkansk glas, indeholder ingen krystaller
- Afkølet superhurtigt, fx ved kontakt med vand
- Meget tyktflydende lava
Tyktflydende
Tyndtflydende
Pimpsten
9000 studerende
3400 ansatte
Full transcript