The rain eroded a stone block arch in your back yard yesterday? That is amazing. I think you might want to put up a security cam.
Nature doesn't have to be quick. Take a bunch of rocks and dirt, or some solid rock, run a stream under the middle. Make the stream bigger, let it start dislodging some rocks, let it flood at times. Eventually there's a good chance you'll have formed an arch as the remaining rocks compress against each other as they try to fall down. It's not going to happen every time of course, but out of the many instances with these conditions you'll get a lot of arches. This is also known as a natural bridge. Arches also naturally occur on coastlines and in caves.
Apples, oranges and other senseless comparisons. Show me the natural arch that looks like the Arch de Triumph and not just a keyhole cut.
I used to let the waves create these natural arches on the beach when I was a kid. It's pretty easy.
Again, you might want to purchase a security cam, if you're getting stone block arches on the beach with wave action.
Ask me again when I actually see it.
Right, because a man is far less complicated than a stone block arch. I know what you would say, because those that refuse to answer in the hypothetical have already dedicated themselves to ignore or shrug off any evidence. You must be very insecure to not even be able to acknowledge that you would find such a thing as the Arch de Triumph on Mars to be incapable of natural origin.
No, this is the issue of "If you didn't see it happen, then there's no way to figure out how it happened."
Show me the natural arch that looks like the Arch de Triumph and not just a keyhole cut.
I don't have to. I gave an example of an ancient, common complex structure in nature that was only far later emulated by man. Complexity doesn't always imply design.
if you're getting stone block arches on the beach with wave action.
That example was to show that I saw on a smaller scale, in a shorter time, effectively the same action that creates one type of natural arch.
You must be very insecure to not even be able to acknowledge that you would find such a thing as the Arch de Triumph on Mars to be incapable of natural origin.
If you're saying that I wouldn't find the one example of a known man-made structure where man has never gone, I can concede that. But it's irrelevant.