What will happen to those bones that have been cremated?

This videos attempts to answer the question:

It is said in Ezekiel 37:5 that dried bones will be given flesh and skin again. What about those bones that have been cremated already?

In addition to Bro Eli's explanation, I want to add that according to the bible, the dead shall also rise again on the last day, irrespective of how long the body has been buried under the ground and what degree of decomposition it has undergone.

For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first. - 1 Thessalonians 4:16

The Word of God cannot be broken. He has pronounced it, and He will bring it to pass. No matter how dry the bone is, or how many atoms it has disintegrated into, they will all come back together, and receive life again.

God bless you...