and what do we use them for to
Too many resources to list them all, but here is three big ones that come to mind: Crude oil, all sea food, and oxygen.
Anyone else care to add?
Technically, crude oil does not come from the ocean (water) but from the rocks below it. The original questioner probably is interested in current resources, but there are also a great many mineral resources that were deposited in former seas from sea water, including salt, gypsum, diatomaceous earth, and phosphate rock (fertilizer).
Present-day offshore mining operations produce sand and gravel in Japan and the UK, diamonds offshore Africa, and titanium rich sands offshore Australia.
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