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Lecture 7

Lecture 7

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University of Toronto Scarborough
Environmental Science
Nick Eyles

EESA06 Lecture 7 Iceland is basalt volcano Ecuador- Pyroclastic volcano o Example of hot spot Naz ca plate moving to the east- volcano being carried away from hot spots and they erode and create hot spot trails o They have flat tops o Become guyots- flat topped dead volcano as part of a hot spot trail About 40 hot spot and most of them in oceanic plates Why do we get islands in the middle of the ocean o Geology of the islands and found 2 things: The age of the rocks on hot spot island compared to surround ocean floor is much younger, because volcano burning their way through the plates When looked at relative ages of islands, found that the youngest island is right above hot spot due to ongoing volcanic activity Hot spots trail gives direction of plate movement Cocos plate rights through Costa Rica Marine iguanas live in water Shield volcanoes , the younger rocks (volcanic activity) occurred towards northwest Bathymetric- map that shows water depths Oldest islands about 3 million years old Shield volcanoes have low profiles- have fluid basalt coming out o Streams of lava o Bumps are result of magma hitting water cal
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