GEOL105_4

GEOL105_4 - the surface of the earth is constant Therefore if there is a crust forming in the ocean the crust somewhere else must disappear –

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Unformatted text preview: the surface of the earth is constant. Therefore, if there is a crust forming in the ocean, the crust somewhere else must disappear – this happens through subduction. The north American side is not sitting on the west side of the east pacific rise. The earth is an useful planet in terms of its crust. 70% of earth’s crust has been formed in the last 4% of earth’s history. Regeneration of the earth’s crust in a record time. The older ocean crusts have been subducted. Cycle of losses of earlier ocean bases and formation of new ones. The rate of sea-floor spreading is uneven. The mid atlantic ridge is quite slow. The rate is not equal everywhere. East pacific rise – very fast spreading. The atlantic basin and the mid atlantic ridge – the mid atlantic ridge is a major topographic feature. Most of the ridge is below the sea level. The ridge carefully topographic feature....
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This note was uploaded on 02/07/2012 for the course GEOL 105 at USC.

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GEOL105_4 - the surface of the earth is constant Therefore if there is a crust forming in the ocean the crust somewhere else must disappear –

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