Limestone is a common type of sedimentary rock which I find uncommonly interesting! It's mostly calcium carbonate, which is also what eggshells π₯, seashells π, and pearls π¦ͺ are made out of.
In places where it rains a lot, limestone erodes easily, which results in simply gorgeous landscapes such as:
HαΊ‘ Long Bay in Vietnam
Tsingy de Bemaraha National Park in Madagascar
The Li River in China
Additionally, the world's longest (Mammoth) and deepest (~~Veryovkina~~ Krubera is once again the world's deepest cave, thank you to SockOlm for pointing that out) cave systems are both found in limestone formations
Mammoth Cave in the United States
Veryovkina Cave in Georgia/Abkhazia/Russia (disputed territory)
image sources
Thumbnail https://commons.m.wikimedia.org/wiki/File:ElTorcal0408.jpg#mw-jump-to-license
HαΊ‘ Long Bay https://commons.m.wikimedia.org/wiki/File:Halong_Bay_in_Vietnam.jpg#mw-jump-to-license
Tsingy de Bemaraha National Park https://commons.m.wikimedia.org/wiki/File:Tsingy_de_Bemaraha.jpg#mw-jump-to-license
Li River https://commons.m.wikimedia.org/wiki/File:Li-Flussfahrt-160-Huegel-2012-gje.jpg#mw-jump-to-license
Mammoth Cave https://commons.m.wikimedia.org/wiki/File:Mammoth_Cave_Rotunda_(USGS_Lwt02830).jpg#mw-jump-to-license
Veryovkina Cave https://commons.m.wikimedia.org/wiki/File:Veryovkina_cave._Babatunda_pit.jpg#mw-jump-to-license
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I think I've gotten it working btw (although I stopped using it because I don't like having notifications I've found), but it does work. I'll try going through the process again later and providing steps (maybe I should finally start working on that "how to matrix" guide in general, I've wanted to make it easier for people to get into since I hate discord with a passion.
Edit: So I installed ntfy from fdroid (via obtanium), and I had to set it's battery optimization to unrestricted so that it could run in the background unhindered (open the app, make sure it has network perms, allow notifications). From there, open fluffychat and it should auto-detect ntfy. With that, it'll start sending notifications! Honestly a great solution for running notifications on apps that support it, I know Element X does as well as so does Molly (signal fork). I'll certainly add this to "the guide" once I get around to making it.