A: The core does not appear to be wood of any kind, but the bottom is wood. The core is the part that has the tongue. It appears to be some sort of MDF. Note that if you are gluing this down with a urethane adhesive, water will not penetrate, provided you are diligent in maintaining tight seams between the boards.
A: Hi there, no it cannot. This is glue down only.
A: It is floating in that it is installed on top of underlayment and not anchored to the subfloor. However, it must be glued down. It does not click into place.
A: It is floating in that it is not anchored to the subfloor, but it is not a click-lock tongue and groove. The groove cannot be nailed, so you have to glue it with something like a urethane adhesive.
A: Wow that was a heavy fork! I have the floor as well and have experienced some scratches. I just use a touch up pen. I haven't experienced that the floor is any less durable that standard oak flooring in other parts of my house. They don't stay spotless unfortunately.