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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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16y ago
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13y ago

Chemical weathering of rocks on the continents is one source of elements found in seawater. The second major source of elements found in seawater is from the Earth's interior.

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16y ago

salt

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Q: What are two sources of dissolved substances in the ocean?
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