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GEOL105_4 - the surface of the earth is constant Therefore...

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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. 
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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.
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The rate of sea-floor spreading is uneven. The mid atlantic ridge is quite slow.  The rate is not equal everywhere. 
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East pacific rise – very fast spreading. 
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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 
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