Question

what property of radioactive nuclear waste makes it so difficult to dispose of responsibly?
it is extremely volatile.
it has a very long half - life.
it is extremely corrosive.
it emits carbon dioxide.

Explanation:

Radioactive nuclear waste has long - lived radionuclides. These remain radioactive for thousands to millions of years due to their long half - life, making safe disposal challenging.

Answer:

It has a very long half - life.