So the ocean is full of sea creatures that are constantly drinking the water and peeing it back out a shrine, so over time wouldn’t the entire ocean become less and less H2O and more fish urine (and blood from predation) until it’s just all fish pee? What piece of the puzzle am I missing?
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First, pee breaks down after a while and isn’t pee anymore, and second, no matter how many fish there are there’s a hell of a lot more ocean.
The water cycle filters water—the nitrogen cycle turns waste into fertilizer. The fertilized plants purify the water. And so on and so forth.
All the water on the planet is the same water that has always been here. You take a shower in dinosaur pee. But it’s been filtered and purified through natural processes.
That’s just one reason we have to protect the environment.
I don’t know how it applies in this specific scenario, but I’m general, nature left unchecked will cycle within itself. The excrement of one creature usually feeds some kind of plant and fertilizes it which then gives back to the ecosystem. So this is general and not specific to the ocean, but I would assume that the components of the iron, excrement, dead fish, blood, etc. all are either used as is for another organism or else break down into something that is usable.
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