The mind is capable of rational thought processes that can take an idea or a problem and break it up into its simpler constructs, or it can construct complex patterns from simpler ideas. Like a computer, it can store information, retrieve that information, and assimilate it. Emotions, needs and drive are also part of these first two levels of consciousness. They greatly affect one's interactions with reality. Science might claim that these two levels are all that exists, although the second layer of reality, the mind, is a little harder to explain in terms of matter and energy.
Soul There is more to a human than just the thought patterns and bodily functions and actions.
There is an awareness of oneself. But, more importantly, to know that you are. Humans can look at their lives, and other's lives, and plan courses of action. They are not necessarily bound to a stimulus producing a set response. Humans can observe a situation and weigh out various courses of action.