Why can't Catholics spread their ashes after cremation?

If we believe when you die your soul is no longer there but moves on to heaven or purgatory or wherever, why does the church care if you are cremated and spread your ashes over the ocean? Could I have Bible references, please. Thank you!

The following links should assist you in better understanding the Catholic Church’s teaching on cremation and the proper repose of ashes. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
**Recommended Reading:
*]Does the Church allow cremation?
*] Catholic Burial ground?
*] What can be done with cremains?
*] Can I bury my ashes at home?
*] Is it correct to keep the cremains of a deceased relative in your home?

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