Very clever 👏, I enjoy riddles and trick questions. Like 10 cows 8 chickens, how many didn’t?
Horizon
What is the line at which the earth’s surface and the sky appear to meet called? Ok you got me on this on again, I have no idea. I would of said the horizon. Let me think..mmm? Uhm?? Is it Viewpoint? I don’t know I give up!!
The answer has already been provided for you there David if you read the question properly.
The line at which the Earth’s surface and the sky appear to meet is called the horizon. It’s the apparent boundary between the Earth and the sky as seen by an observer.
That is not the right answer Christian. The answer is right there
I think it’s the horizon? I hope it’s not one of your riddles, there’s no telling with you. It’s the the horizon I’m sure!!
It is not the right answer David. Read the question properly. The answer is there.

It is the wrong answer Stephen. The answer has already been provided there for you if you read the question properly. Thanks for your contribution.