this post was submitted on 19 Aug 2024
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Breadtube if it didn't suck.

Post videos you genuinely enjoy and want to share, duh. Celebrate the diversity of interests shared by chapochatters by posting a deep dive into Venetian kelp farming, I dunno. Also media criticism, bite-sized versions of left-wing theory, all the stuff you expected. But I am curious about that kelp farming thing now that you mentioned it.

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[–] iie@hexbear.net 3 points 3 months ago* (last edited 3 months ago)

I recently learned a really weird piece of evidence geologists apparently look at: heavy oxygen trapped in rocks. Turns out water with oxygen18 is slower to evaporate than water with the lighter oxygen16, which apparently means that rocks absorb oxygen18 water more readily than oxygen16 water, and therefore landmasses tend to accumulate oxygen18 leaving less in the seas... which means, when geologists find really old sea floor rocks full of oxygen18, it suggests that there was a lot more oxygen18 in the seas back then, which suggests that there was very little dry land to absorb oxygen18, meaning ancient earth might have been a water world, which is what we see in the start of the video.

https://www.astronomy.com/science/ancient-earth-may-have-been-a-water-world-with-no-dry-land/

*which also has obvious implications for the origins of life, as the article mentions—none of Darwin's "warm little ponds"