Primary adamantium is supposedly indestructible, secondary adamantium can be destroyed by the likes of Thor and the Hulk, although it takes effort.
The you have the proto-adamantium used in Captain America's shield which is supposedly "even more indestructible" than primary adamantium, but the only sample of it is part of his shield and mixed with vibranium.
Although Thor did manage buckle it and straighten out the buckle in a comic for some reason.
To be clear, I'm not sure if this has changed. I don't think it has. But there was some controversy when the Hulk ripped Wolverine apart in the Ultimate Universe, but that was actually resolved by a confirmation that Ultimate Wolverine's adamantium skeleton was a coating if I recall correctly.
So I agree with the others in the thread: #1, #2 and #4 goes to the adamantium.
10,000 ton hydraulic presses rely on heat-treated 4140 or 4340 steel for their cylinder rods, but I couldn't find any material data for the cylinder rod of the 50,000 ton or the 80,000 ton hydraulic presses. But it doesn't really matter, since if Thor can withstand 80,000 tons then there's not much any hydraulic press could do to him anyway.
I mentioned Thor's skin (which is about 1mm in thickness). Thor also has muscle tissue, tendons, and bone. All which is needed for him to withstand the tonnage he does. I was primarily thinking about the time aircraft bullets put welts on his skin.
Right, but you're still talking about the stress that his skin would have to endure when living unimaginable weights. Our muscles and joints tend to give in before our skin does, but you can still tear your skin bench-pressing if you have a bad grip.
But it also depends on what you mean, is it going to be a plate underneath the skin or is it going to be like a trampoline? Because it might just stretch out instead of actually tearing.
Now, different writers are going to have different interpretations of him. And if aircraft rounds breaks his skin then the press would too. But that would not be consistent with some of his better strength feats.