I didn't mention the shape of the earth. I keep asking why it pushes down because you have not actually explained it. You may think you have but if you notice that's the main question you get asked.
Ok, here goes.
To try and answer you I'm going to have to ask you some questions and see how you answer them. Then I can slowly go on from there.
First question: When you breathe in, you expand your lungs which expand your chest and what not, right?
What forces you to eventually breathe out?
We know it's your energy but what makes your energy release that air hold?
Not sure what you are asking. Is this a biology question or anatomy or chemistry? I mean the air is drawn into my lungs because, and I am not a student of anatomy so I'm kind of guessing here, muscles in my chest pull my lungs, increasing their capacity, thus drawing air in. I btreathe out when muscles compress my lungs forcing air out.
its an easy tactic from scepti:
you ask him an easy question.
he "answers" with an question that has nothing to do with the initial question.
you answer in the hope he will give you an explanation for the first question.
he does not like your answer and says that you are not able to understand the complete topic what you were questioning about and he will not give you an answer.
it seams the only way to get an answer from him would be to admit to his idea and say he is right, but than i expect that he either says that he does not believe you, or he than says if you believe him why should he answer you.
in any cases, he never will give us an explanation about his idea.
anytime he says he will answer you after a few questions, he is lying.
And that brings us also to 2 things:
what is the real reason he refuse to answer us?
either he knows he does has no explanation for his idea,
or he really believes what he is making up as his idea.
in the first case he is a simple lair
in the second case he is a sociopatic lair, than we can not be to mad him because it a mental condition he is not responsible for it.