Why is nuclear waste dangerous for so long?

Answer: Emits radiation for thousands of years

Emits radiation for thousands of years ✓ — Correct! Nuclear waste contains radioactive isotopes that emit harmful radiation as they decay. Some isotopes have half-lives of thousands of years, remaining dangerous for geological timescales. Radiation damages DNA, causing cancer.

Extremely hot and burns everything — Wrong. Spent fuel is initially hot but cools within years. The long-term danger is radiation, not heat. After cooling, waste is still radioactive for millennia.

Explodes if not stored properly — Wrong. Nuclear waste doesn't explode. The danger is radiation—high-energy particles emitted during radioactive decay that damage living cells for thousands of years.