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EESA06H3 (540)
Nick Eyles (472)
Lecture 4

Lecture 4 In Class Notes

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University of Toronto Scarborough
Environmental Science
Nick Eyles

- As the oceanic crust moves away from the ridge, it expands and is thicker due to the cooling process o This leads to the ocean floor to start to subduct - The history of the earth is controlled by the ocean history - Ophiolites are ancient pieces of oceanic crust that gets pushed up on land instead of being subducting under the continental crust. Fossil ocean crust preserved on land o These are rich in minerals - Jokulhlaups: is volcanic activity beneath glaciers (word means to leap from the mountains) o Causes flash floods - Fractures: are cracks in the ridges, they enable ocean floor spreading on the curved floor of the earth - Dikes: are the result of hot magma intruding into older rock along fractures, thus causing the rock to push apart - Gabbro: is the
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