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The two main sources of sediment in the deep sea are:

(1) Coastal Erosion - rivers, wind-blown dust and sand (from the deserts), volcanic eruptions (ash), glacially dumped sediment - about 45%

(2) Dead organisms - shells and skeletons - about 55% The other two are least common: Precipitation from supersaturated water (less than 1%), and Extraterrestrial in origin (a tiny fraction of 1%)

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