Why are there gravel beaches? In thousands of years of waves crashing on the beach shouldn’t all the gravel have become sand?
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If we were to speed time up while watching the earth’s surface from space, we would see the earth’s crust constantly moving, forming, reforming, and shaping.
As humans, it’s hard to picture something like rock and earth as fluid and mobile, but over thousands of years…
I was taught pebbled beaches were either young beaches (created more recently), or the result of geologic activity.
I hope this helps. IANA geologist, am farmer.
>shouldn’t all the gravel have become sand?
Well, this is just a guess, but I’d say since that didn’t happen, then your assumption that waves erode gravel is wrong.
So, there are gravel beaches because there’s no reason for there not to be.
Did you need anything else?
Not a natural thing, but In the UK, some of our beaches have had gravel dumped on them to help stop erosion,. Used to have sand down south and now we have lovely lumpy gravel.
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