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Lecture

ARH306Y1 Lecture Notes - Oceanic Crust, Challenger Deep, Subduction


Department
Archaeology
Course Code
ARH306Y1
Professor
All

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Lecture'5'
'
When'oceans'close'the'volcanoes'that'form'are'pyroclastic'cones'
o Steep'sided'volcanoes'
o Magmas'have'silica'in'them;'stiff'
o Gases'can’t'come'out;'sudden'release'
o Debris'blown'up'into'the'air'during'massive'eruptions'
o Produce'a'lot'of'ash'
The'Pacific'Rim'of'Fire'
o New'Zealand'
o Indonesia'
o Japan'
o Alaska'
o British'Colombia'
o California'
o Chile'
'
Deep'water'trenches'around'the'rim'
o Deepest'part'of'the'whole'ocean'system'on'earth'is'the'Challenger'
Deep'
o Mark'where'the'floor'of'the'pacific'ocean'is'being'pushed'down'
underneath'the'surrounding'land'masses'
o Subduction'zones'
o This'is'how'earth'recycles'ancient'crust'
o Like'a'big'stranglehold'
Canada'is'also'a'pacific'rim'country'
o Vancouver'is'threatened'by'a'major'earthquake'
The'continents'surrounding'the'rim'are'growing'at'the'expense'of'the'oceans'
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