New answers tagged

2

Bird Crap No, seriously. Guano is a hugely valuable source for fertilizer and (moreso bat guano) explosives. (Bat guano especially has high concentrations of saltpeter.) To the point where multiple wars have been fought over guano deposits. Not a massive thing in the ancient/medieval world, but once you get gunpowder and a dense enough population to feed ...


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Floating islands are made of floating dust that gets progressively liberated from seabed. Indeed they don't erode, they grow.


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The same force that's holding them up Let's say that there's some sort of gravitational anomaly that's holding the islands up. Let's also say that it's uneven, thus causing the material to rest in clumps. That means that any dust that blows past will tend to settle on the island, at a similar rate to the dust being blown off. If the island gets a bit too big,...


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Islands are like icebergs - calving from (depending on your preference) from either solidified magical lava spouted by magical volcanoes (my preference) or magical ice fields. Of course magical material fells off al the time, and drifts down when not bind tightly to other magical pieces. So it spreads all over the planet, making areas with more material more ...


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The Magic Binds Them In the same way as a planet would turn to a dust cloud without gravity, the islands would wear away to dust without magic. The magic provides a force that slowly pulls loose dust and clumps of dirt back to the existing islands. If the magic provided a small degree of attraction between every particle of the dirt and stone, you would have ...


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Volcanoes Each floating island - or at least each one that survives erosion - has a regular supply of new material through a volcano on the island. If islands can float, there is no reason to believe that matter could not spontaneously form in or be magically transported to the volcanoes, maybe even from the place the island originally was created on the ...


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If you consider erosion, you need to consider how these islands came to existence in the first place. Obsessing over "how do we keep material" while ignoring "how did that happen in the first place" is just pointless - especially as you can ignore erosion in a typical span of a story because it is a very slow process. It can be even a ...


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Just look at what prevents erosion of islands in the ocean! Wind and waves may not be the same but similar methods can be used to prevent them. Vegetation is very good at preventing erosion, and so are coral reefs if you want to make a version of those to grow on your islands. But that's just the tip of the iceberg especially if you're including artificial ...


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Where on Earth did THAT come from? A magical floating island BY DEFINITION is violating the laws of physics. But we want some reasonable plausible ways that these still exist. I will give some different options, some of which may or may not fit. First, we need to know how the islands are created in the first place, and why they don't fall. I'll assume island ...


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Nothing. Eventually - over many thousands of years - a floating island will indeed be diminished until it's nothing but dust. However, individual grains of floating island don't themselves float forever because they aren't magically powerful enough. Instead, they gradually sink back to earth and are deposited in sediments and then compressed under great ...


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Ice. The islands are sky glaciers, in large part (or in whole) composed of ice. When it is cold the islands grow from rain and snow deposited on them. In warm weather they shrink. If it were sunny and cold, water might melt on the sunny top and refreeze on the bottom, forming long icicles.


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Magical Stasis The floating Isle can't erode since the spell binded everything together. You can see the wind taking part of the dirt and some flowers away, but at the same time you see how little rocks move slowly towards their original position and little petals in the wind attach themselves after dancing free for a few moments.


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Vegetation Thanks to animals and plants you can grow your island. Roots can overhang or pierce the island, getting nutrition out of the water and deposit it on the island in one way or the other. Even just sucking the ground water inside the island can help attract nutrients. Vegetation is crucial to hold things together and prevent erosion as well. ...


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The doldrums. https://www.poetryfoundation.org/poems/43997/the-rime-of-the-ancient-mariner-text-of-1834 Day after day, day after day, We stuck, nor breath nor motion; As idle as a painted ship Upon a painted ocean. Water, water, every where, And all the boards did shrink; Water, water, every where, Nor any drop to drink. The doldrums were areas of ocean ...


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