The contradiction is that you are trying to apply moral worth to inanimate objects while attempting to confuse me with science (of which you probably understand less than you let on), whose realm is entirely separate from what constitutes moral behavior. Nonetheless, you try to conflate them.
We are made of matter, no different than the rock. Our bodies are subject to the same laws, which means we are of the same moral worth of the rock according to your logic, EXCEPT that we have abilities that it lacks.
That means that, in accordance with your own logic, you would have to either concede that free will does not exist and we are thus- at the very least- morally equal (not inferior) to the rock, or that we are capable of moral choice, which is a potentially positive quality the rock lacks.
The sum of your assertions is essentially nihilistic. You're arguing that- because it is inanimate- a rock has greater moral worth. That is tantamount to saying death makes a person morally superior to when they are alive, which can be extrapolated to mean that the goal of a moral life is to cause as much death as possible.
And if you believe that, then please, by all means you can join ISIS, and I will join the US Army on the same effing day. We'll see who wins out with that one.