Seshadri, please go through this link, and see the works (abstract) of Adi Shankara in refuting Charvakas..
http://rashmun.sulekha.com/blog/post/2007/07/adi-sankar-on-charvakas-2.htm
There is a piece of empty land and scattered bricks stones and wood lying around...
Now, on the same plot of land the bricks/stones & wood are arranged to form a house/warehouse/factory/playschool.. etc... depends on how it is used and perceived...
So the components are the same, but the usage and names are varied.
Again, the usage and names only arise when there is a construction... the empty space under the building, whether it be a factory or a school, is the same, but in entirety, it is identified differently... Similarly, the components are the same, but when arranged differently, it gives a different appearance and a change to the identity...
The identity of the structure stands as long as its components hold together; obviously gross matter degrades over time, but can it be inferred to conclude that the empty space occupied by the matter is superior over matter itself?
It could be that the combining of various gross matter itself gives rise to a new combination, which is synergic, symbiotic and balanced...
It could be that creation was only random, consciousness itself could be a product and not the source!
How do we prove it?
Similarly, there could be gross consciousness or empty space everywhere, & gross matter everywhere... but when combined together in a particular pattern, the identity arises... Again, there could be a few possibilities -
The beings are nothing but empty space and gross matter infused by consciousness to spark the mind (in this context consciousness would be an external entity)...
The second is that consciousness itself blends with gross matter to create/experience the identity of the being...
The third is that, the natural combination of matter uniquely brings forth a mechanism that controls the combination itself (for its benefit)...
If we assume consciousness as the blending authority, then it could be say that the soul is different from the body...
If we assume the the mind is a natural combination of matter, then it could be said that the soul/mind is different from matter, but only a product... and that is why when matter deteriorates, there is no more mind/soul...