The dust will return to the earth as it was. 

The body is sown in corruption … It is sown in dishonor … It is sown in weakness … It is sown a natural body. § The first man was of the earth, made of dust. § Dust you are, and to dust you shall return. § One dies in his full strength, being wholly at ease and secure …  Another man dies in the bitterness of his soul, never having eaten with pleasure. They lie down alike in the dust, and worms cover them.My flesh … will rest in hope. § After my skin is destroyed, this I know, that in my flesh I shall see God. § The Lord Jesus Christ … will transform our lowly body that it may be conformed to His glorious body, according to the working by which He is able even to subdue all things to Himself.Lord, make me to know my end, and what is the measure of my days, that I may know how frail I am. § So teach us to number our days, that we may gain a heart of wisdom.