I kind of get that, but what hope do we have of ever breeding chickens which are no as susceptible to bird flu if we just kill them all? Surely, some would survive that have greater immunity. At this point it seems almost inevitable that most farms are going to be hit.

I’m working on this constructed world where there’s this series of tropical islands but the entire world was frozen until very recently in the past so they have like glacial erosion in a tropical environment

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Way too much risk, also it is usually recommended by the health departments. And the stable or where they are kept in needs to be sanitized, with surviving birds you can't be sure you get all of it which would endanger humans and birds alike. Also they usually just buy chicks or eggs and feed them until big enough which does not take long. Compared to nursing ill birds back to health it's probably more cost effective.

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Weathering definitely happens at different speeds, depending on the type and intensity of weathering. There mainly are 3 types:

• physical (water and wind move sand and small rocks around, they become smaller through friction; material reacts to temperature differences by extending/shrinking, making way for water to intrude through cracks; also water then potentially freezing, extending and breaking rocks)

• chemical (water reacts with minerals, resulting in the emergence of more or less potent acids)

• biochemical (mainly driven by organic acids, created by decaying organisms, root secretions, huminic acids)

These three interact with each other. Weathering intensity is highest near the equator, because of basically all the life that's happening there. Great biodiversity + heavy precipitation year round means lots of fuel for weathering.

Interestingly, there's also the concept of relief energy - weathering in great heights happens quicker simply because of the greater potential/gravitational energy.

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Sorta like climate-change deniers using a particularly cold week to "prove" their point.

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Unless you are talking about breeder, most farmers buy eggs which are breed specifically for what they want (eggs or meat). Most commercial breed are three breed cross, mother and father different, breed this chicken again to get what you want. They use very specific breed to obtain the result they seek. They would need to do this with the parents for many generations to get a stable breed again. Not that easy to do and they might not have the sae exact traits they want.

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because they cant control the spread of the virus. There is too much risk having survivors that could be virus carriers. the flu would spread to new comers, or even worse to nearby poultry farms.

this is in many cases mandated by authorities.

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Oh man. That's something that's bugged me for as long as I've been on the Internet. It is absolutely amazing how often you can describe a trend, and somebody will mention one of the exceptions to that trend, and sit back smugly as if they've somehow proven your understanding of a statistical distribution is wrong.

In addition to the others issue mentioned here - A lot of tropical areas have coral sand, so a different source than stone weathering ( quartz sand - common on the East coast of the us) -

Coral sand is also very light and more likely to be shifted in current.